Immediate action needs to be taken for all installations using the unpatched versions of those libraries. Red Hat has already pushed patches for the affected Red Hat Enterprise Linux 6, Fedora 19 and 20 releases of its operating systems (these updates were posted yesterday).
The vulnerability exposed by this bug is real.
[For anyone who needs to explain the threat to a non-technical audience, I’d recommend this excellent video as a resource.]
The impact of this bug is still being assessed but system administrators and security analysts are urged to review their software inventories to determine if any of their systems need to be patched. Some researchers are suggesting that it may be necessary to revoke and reissue SSL certificates used with the vulnerable libraries because the bug may have exposed the cryptographic keys for those certificates.
The good news is that although the bug was only announced yesterday, the major Linux vendors, including Red Hat, have responded quickly to issue the fix.
Go here for a script that will audit your Perl5 installation for the vulnerability.
Admins should keep in mind that this bug is very specifically targeted to the TLS heartbeat mechanism in the affected versions of OpenSSL. It does not affect every SSL-enabled service. For example, OpenSSH is safe.
Anything using NSS (Netscape Security Services), like the old iPlanet and Sun products (e.g. SunONE Directory, Oracle Directory Server Enterprise Edition), would also not be affected.
It should be noted that Red Hat, who owns a lot of Netscape’s identity management and security code, has over the last few years been incorporating NSS in its products as an alternative to OpenSSL. Red Hat’s distribution of the Apache HTTP Server, for example, can be configured to use NSS instead of OpenSSL.
Applications using the Java pki framework, like Oracle Unified Directory, Sun’s OpenDS and ForgeRock’s OpenDJ would also be unaffected. This is also true of ForgeRock’s OpenAM and OpenIDM.
Google’s Search Appliance v7 is affected, notice that a patch is available was e-mailed to customers on April 14, 2014 at 9:32 AM (GSA is a “black box” — actually encased in bright yellow plastic — so admins had no way of knowing it used OpenSSL apart from a blog post on April 9 by Google that said a patch was being worked on).
Some excellent discussions about this all are here:
Existential Crisis: Diagnosis of the OpenSSL Heartbleed Bug (includes detailed analysis of the C code involved)
For any of the “see, this is why keeping things up to date is a waste of time” crowd who may be out strutting like a peacock because they dodged this bullet due to laziness and stupidity, I would refer to the changelog for versions prior to 1.0.1, in reverse chronological order. People like you should be fired or reassigned to sales.
Major changes between OpenSSL 1.0.0h and OpenSSL 1.0.1 [14 Mar 2012]: TLS/DTLS heartbeat support. SCTP support. RFC 5705 TLS key material exporter. RFC 5764 DTLS-SRTP negotiation. Next Protocol Negotiation. PSS signatures in certificates, requests and CRLs. Support for password based recipient info for CMS. Support TLS v1.2 and TLS v1.1. Preliminary FIPS capability for unvalidated 2.0 FIPS module. SRP support. Major changes between OpenSSL 1.0.0k and OpenSSL 1.0.0l [6 Jan 2014] Fix for DTLS retransmission bug CVE-2013-6450 Major changes between OpenSSL 1.0.0j and OpenSSL 1.0.0k [5 Feb 2013]: Fix for SSL/TLS/DTLS CBC plaintext recovery attack CVE-2013-0169 Fix OCSP bad key DoS attack CVE-2013-0166 Major changes between OpenSSL 1.0.0i and OpenSSL 1.0.0j [10 May 2012]: Fix DTLS record length checking bug CVE-2012-2333 Major changes between OpenSSL 1.0.0h and OpenSSL 1.0.0i [19 Apr 2012]: Fix for ASN1 overflow bug CVE-2012-2110 Major changes between OpenSSL 1.0.0g and OpenSSL 1.0.0h [12 Mar 2012]: Fix for CMS/PKCS#7 MMA CVE-2012-0884 Corrected fix for CVE-2011-4619 Various DTLS fixes. Major changes between OpenSSL 1.0.0f and OpenSSL 1.0.0g [18 Jan 2012]: Fix for DTLS DoS issue CVE-2012-0050 Major changes between OpenSSL 1.0.0e and OpenSSL 1.0.0f [4 Jan 2012]: Fix for DTLS plaintext recovery attack CVE-2011-4108 Clear block padding bytes of SSL 3.0 records CVE-2011-4576 Only allow one SGC handshake restart for SSL/TLS CVE-2011-4619 Check parameters are not NULL in GOST ENGINE CVE-2012-0027 Check for malformed RFC3779 data CVE-2011-4577 Major changes between OpenSSL 1.0.0d and OpenSSL 1.0.0e [6 Sep 2011]: Fix for CRL vulnerability issue CVE-2011-3207 Fix for ECDH crashes CVE-2011-3210 Protection against EC timing attacks. Support ECDH ciphersuites for certificates using SHA2 algorithms. Various DTLS fixes. Major changes between OpenSSL 1.0.0c and OpenSSL 1.0.0d [8 Feb 2011]: Fix for security issue CVE-2011-0014 Major changes between OpenSSL 1.0.0b and OpenSSL 1.0.0c [2 Dec 2010]: Fix for security issue CVE-2010-4180 Fix for CVE-2010-4252 Fix mishandling of absent EC point format extension. Fix various platform compilation issues. Corrected fix for security issue CVE-2010-3864. Major changes between OpenSSL 1.0.0a and OpenSSL 1.0.0b [16 Nov 2010]: Fix for security issue CVE-2010-3864. Fix for CVE-2010-2939 Fix WIN32 build system for GOST ENGINE. Major changes between OpenSSL 1.0.0 and OpenSSL 1.0.0a [1 Jun 2010]: Fix for security issue CVE-2010-1633. GOST MAC and CFB fixes. Major changes between OpenSSL 0.9.8n and OpenSSL 1.0.0 [29 Mar 2010]: RFC3280 path validation: sufficient to process PKITS tests. Integrated support for PVK files and keyblobs. Change default private key format to PKCS#8. CMS support: able to process all examples in RFC4134 Streaming ASN1 encode support for PKCS#7 and CMS. Multiple signer and signer add support for PKCS#7 and CMS. ASN1 printing support. Whirlpool hash algorithm added. RFC3161 time stamp support. New generalised public key API supporting ENGINE based algorithms. New generalised public key API utilities. New ENGINE supporting GOST algorithms. SSL/TLS GOST ciphersuite support. PKCS#7 and CMS GOST support. RFC4279 PSK ciphersuite support. Supported points format extension for ECC ciphersuites. ecdsa-with-SHA224/256/384/512 signature types. dsa-with-SHA224 and dsa-with-SHA256 signature types. Opaque PRF Input TLS extension support. Updated time routines to avoid OS limitations. Major changes between OpenSSL 0.9.8x and OpenSSL 0.9.8y [5 Feb 2013]: Fix for SSL/TLS/DTLS CBC plaintext recovery attack CVE-2013-0169 Fix OCSP bad key DoS attack CVE-2013-0166 Major changes between OpenSSL 0.9.8w and OpenSSL 0.9.8x [10 May 2012]: Fix DTLS record length checking bug CVE-2012-2333 Major changes between OpenSSL 0.9.8v and OpenSSL 0.9.8w [23 Apr 2012]: Fix for CVE-2012-2131 (corrected fix for 0.9.8 and CVE-2012-2110) Major changes between OpenSSL 0.9.8u and OpenSSL 0.9.8v [19 Apr 2012]: Fix for ASN1 overflow bug CVE-2012-2110 Major changes between OpenSSL 0.9.8t and OpenSSL 0.9.8u [12 Mar 2012]: Fix for CMS/PKCS#7 MMA CVE-2012-0884 Corrected fix for CVE-2011-4619 Various DTLS fixes. Major changes between OpenSSL 0.9.8s and OpenSSL 0.9.8t [18 Jan 2012]: Fix for DTLS DoS issue CVE-2012-0050 Major changes between OpenSSL 0.9.8r and OpenSSL 0.9.8s [4 Jan 2012]: Fix for DTLS plaintext recovery attack CVE-2011-4108 Fix policy check double free error CVE-2011-4109 Clear block padding bytes of SSL 3.0 records CVE-2011-4576 Only allow one SGC handshake restart for SSL/TLS CVE-2011-4619 Check for malformed RFC3779 data CVE-2011-4577 Major changes between OpenSSL 0.9.8q and OpenSSL 0.9.8r [8 Feb 2011]: Fix for security issue CVE-2011-0014 Major changes between OpenSSL 0.9.8p and OpenSSL 0.9.8q [2 Dec 2010]: Fix for security issue CVE-2010-4180 Fix for CVE-2010-4252 Major changes between OpenSSL 0.9.8o and OpenSSL 0.9.8p [16 Nov 2010]: Fix for security issue CVE-2010-3864. Major changes between OpenSSL 0.9.8n and OpenSSL 0.9.8o [1 Jun 2010]: Fix for security issue CVE-2010-0742. Various DTLS fixes. Recognise SHA2 certificates if only SSL algorithms added. Fix for no-rc4 compilation. Chil ENGINE unload workaround. Major changes between OpenSSL 0.9.8m and OpenSSL 0.9.8n [24 Mar 2010]: CFB cipher definition fixes. Fix security issues CVE-2010-0740 and CVE-2010-0433. Major changes between OpenSSL 0.9.8l and OpenSSL 0.9.8m [25 Feb 2010]: Cipher definition fixes. Workaround for slow RAND_poll() on some WIN32 versions. Remove MD2 from algorithm tables. SPKAC handling fixes. Support for RFC5746 TLS renegotiation extension. Compression memory leak fixed. Compression session resumption fixed. Ticket and SNI coexistence fixes. Many fixes to DTLS handling. Major changes between OpenSSL 0.9.8k and OpenSSL 0.9.8l [5 Nov 2009]: Temporary work around for CVE-2009-3555: disable renegotiation. Major changes between OpenSSL 0.9.8j and OpenSSL 0.9.8k [25 Mar 2009]: Fix various build issues. Fix security issues (CVE-2009-0590, CVE-2009-0591, CVE-2009-0789) Major changes between OpenSSL 0.9.8i and OpenSSL 0.9.8j [7 Jan 2009]: Fix security issue (CVE-2008-5077) Merge FIPS 140-2 branch code. Major changes between OpenSSL 0.9.8g and OpenSSL 0.9.8h [28 May 2008]: CryptoAPI ENGINE support. Various precautionary measures. Fix for bugs affecting certificate request creation. Support for local machine keyset attribute in PKCS#12 files. Major changes between OpenSSL 0.9.8f and OpenSSL 0.9.8g [19 Oct 2007]: Backport of CMS functionality to 0.9.8. Fixes for bugs introduced with 0.9.8f. Major changes between OpenSSL 0.9.8e and OpenSSL 0.9.8f [11 Oct 2007]: Add gcc 4.2 support. Add support for AES and SSE2 assembly lanugauge optimization for VC++ build. Support for RFC4507bis and server name extensions if explicitly selected at compile time. DTLS improvements. RFC4507bis support. TLS Extensions support. Major changes between OpenSSL 0.9.8d and OpenSSL 0.9.8e [23 Feb 2007]: Various ciphersuite selection fixes. RFC3779 support. Major changes between OpenSSL 0.9.8c and OpenSSL 0.9.8d [28 Sep 2006]: Introduce limits to prevent malicious key DoS (CVE-2006-2940) Fix security issues (CVE-2006-2937, CVE-2006-3737, CVE-2006-4343) Changes to ciphersuite selection algorithm Major changes between OpenSSL 0.9.8b and OpenSSL 0.9.8c [5 Sep 2006]: Fix Daniel Bleichenbacher forged signature attack, CVE-2006-4339 New cipher Camellia Major changes between OpenSSL 0.9.8a and OpenSSL 0.9.8b [4 May 2006]: Cipher string fixes. Fixes for VC++ 2005. Updated ECC cipher suite support. New functions EVP_CIPHER_CTX_new() and EVP_CIPHER_CTX_free(). Zlib compression usage fixes. Built in dynamic engine compilation support on Win32. Fixes auto dynamic engine loading in Win32. Major changes between OpenSSL 0.9.8 and OpenSSL 0.9.8a [11 Oct 2005]: Fix potential SSL 2.0 rollback, CVE-2005-2969 Extended Windows CE support Major changes between OpenSSL 0.9.7g and OpenSSL 0.9.8 [5 Jul 2005]: Major work on the BIGNUM library for higher efficiency and to make operations more streamlined and less contradictory. This is the result of a major audit of the BIGNUM library. Addition of BIGNUM functions for fields GF(2^m) and NIST curves, to support the Elliptic Crypto functions. Major work on Elliptic Crypto; ECDH and ECDSA added, including the use through EVP, X509 and ENGINE. New ASN.1 mini-compiler that's usable through the OpenSSL configuration file. Added support for ASN.1 indefinite length constructed encoding. New PKCS#12 'medium level' API to manipulate PKCS#12 files. Complete rework of shared library construction and linking programs with shared or static libraries, through a separate Makefile.shared. Rework of the passing of parameters from one Makefile to another. Changed ENGINE framework to load dynamic engine modules automatically from specifically given directories. New structure and ASN.1 functions for CertificatePair. Changed the ZLIB compression method to be stateful. Changed the key-generation and primality testing "progress" mechanism to take a structure that contains the ticker function and an argument. New engine module: GMP (performs private key exponentiation). New engine module: VIA PadLOck ACE extension in VIA C3 Nehemiah processors. Added support for IPv6 addresses in certificate extensions. See RFC 1884, section 2.2. Added support for certificate policy mappings, policy constraints and name constraints. Added support for multi-valued AVAs in the OpenSSL configuration file. Added support for multiple certificates with the same subject in the 'openssl ca' index file. Make it possible to create self-signed certificates using 'openssl ca -selfsign'. Make it possible to generate a serial number file with 'openssl ca -create_serial'. New binary search functions with extended functionality. New BUF functions. New STORE structure and library to provide an interface to all sorts of data repositories. Supports storage of public and private keys, certificates, CRLs, numbers and arbitrary blobs. This library is unfortunately unfinished and unused withing OpenSSL. New control functions for the error stack. Changed the PKCS#7 library to support one-pass S/MIME processing. Added the possibility to compile without old deprecated functionality with the OPENSSL_NO_DEPRECATED macro or the 'no-deprecated' argument to the config and Configure scripts. Constification of all ASN.1 conversion functions, and other affected functions. Improved platform support for PowerPC. New FIPS 180-2 algorithms (SHA-224, -256, -384 and -512). New X509_VERIFY_PARAM structure to support parametrisation of X.509 path validation. Major overhaul of RC4 performance on Intel P4, IA-64 and AMD64. Changed the Configure script to have some algorithms disabled by default. Those can be explicitely enabled with the new argument form 'enable-xxx'. Change the default digest in 'openssl' commands from MD5 to SHA-1. Added support for DTLS. New BIGNUM blinding. Added support for the RSA-PSS encryption scheme Added support for the RSA X.931 padding. Added support for BSD sockets on NetWare. Added support for files larger than 2GB. Added initial support for Win64. Added alternate pkg-config files. Major changes between OpenSSL 0.9.7l and OpenSSL 0.9.7m [23 Feb 2007]: FIPS 1.1.1 module linking. Various ciphersuite selection fixes. Major changes between OpenSSL 0.9.7k and OpenSSL 0.9.7l [28 Sep 2006]: Introduce limits to prevent malicious key DoS (CVE-2006-2940) Fix security issues (CVE-2006-2937, CVE-2006-3737, CVE-2006-4343) Major changes between OpenSSL 0.9.7j and OpenSSL 0.9.7k [5 Sep 2006]: Fix Daniel Bleichenbacher forged signature attack, CVE-2006-4339 Major changes between OpenSSL 0.9.7i and OpenSSL 0.9.7j [4 May 2006]: Visual C++ 2005 fixes. Update Windows build system for FIPS. Major changes between OpenSSL 0.9.7h and OpenSSL 0.9.7i [14 Oct 2005]: Give EVP_MAX_MD_SIZE it's old value, except for a FIPS build. Major changes between OpenSSL 0.9.7g and OpenSSL 0.9.7h [11 Oct 2005]: Fix SSL 2.0 Rollback, CVE-2005-2969 Allow use of fixed-length exponent on DSA signing Default fixed-window RSA, DSA, DH private-key operations Major changes between OpenSSL 0.9.7f and OpenSSL 0.9.7g [11 Apr 2005]: More compilation issues fixed. Adaptation to more modern Kerberos API. Enhanced or corrected configuration for Solaris64, Mingw and Cygwin. Enhanced x86_64 assembler BIGNUM module. More constification. Added processing of proxy certificates (RFC 3820). Major changes between OpenSSL 0.9.7e and OpenSSL 0.9.7f [22 Mar 2005]: Several compilation issues fixed. Many memory allocation failure checks added. Improved comparison of X509 Name type. Mandatory basic checks on certificates. Performance improvements. Major changes between OpenSSL 0.9.7d and OpenSSL 0.9.7e [25 Oct 2004]: Fix race condition in CRL checking code. Fixes to PKCS#7 (S/MIME) code. Major changes between OpenSSL 0.9.7c and OpenSSL 0.9.7d [17 Mar 2004]: Security: Fix Kerberos ciphersuite SSL/TLS handshaking bug Security: Fix null-pointer assignment in do_change_cipher_spec() Allow multiple active certificates with same subject in CA index Multiple X509 verification fixes Speed up HMAC and other operations Major changes between OpenSSL 0.9.7b and OpenSSL 0.9.7c [30 Sep 2003]: Security: fix various ASN1 parsing bugs. New -ignore_err option to OCSP utility. Various interop and bug fixes in S/MIME code. SSL/TLS protocol fix for unrequested client certificates. Major changes between OpenSSL 0.9.7a and OpenSSL 0.9.7b [10 Apr 2003]: Security: counter the Klima-Pokorny-Rosa extension of Bleichbacher's attack Security: make RSA blinding default. Configuration: Irix fixes, AIX fixes, better mingw support. Support for new platforms: linux-ia64-ecc. Build: shared library support fixes. ASN.1: treat domainComponent correctly. Documentation: fixes and additions. Major changes between OpenSSL 0.9.7 and OpenSSL 0.9.7a [19 Feb 2003]: Security: Important security related bugfixes. Enhanced compatibility with MIT Kerberos. Can be built without the ENGINE framework. IA32 assembler enhancements. Support for new platforms: FreeBSD/IA64 and FreeBSD/Sparc64. Configuration: the no-err option now works properly. SSL/TLS: now handles manual certificate chain building. SSL/TLS: certain session ID malfunctions corrected. Major changes between OpenSSL 0.9.6 and OpenSSL 0.9.7 [30 Dec 2002]: New library section OCSP. Complete rewrite of ASN1 code. CRL checking in verify code and openssl utility. Extension copying in 'ca' utility. Flexible display options in 'ca' utility. Provisional support for international characters with UTF8. Support for external crypto devices ('engine') is no longer a separate distribution. New elliptic curve library section. New AES (Rijndael) library section. Support for new platforms: Windows CE, Tandem OSS, A/UX, AIX 64-bit, Linux x86_64, Linux 64-bit on Sparc v9 Extended support for some platforms: VxWorks Enhanced support for shared libraries. Now only builds PIC code when shared library support is requested. Support for pkg-config. Lots of new manuals. Makes symbolic links to or copies of manuals to cover all described functions. Change DES API to clean up the namespace (some applications link also against libdes providing similar functions having the same name). Provide macros for backward compatibility (will be removed in the future). Unify handling of cryptographic algorithms (software and engine) to be available via EVP routines for asymmetric and symmetric ciphers. NCONF: new configuration handling routines. Change API to use more 'const' modifiers to improve error checking and help optimizers. Finally remove references to RSAref. Reworked parts of the BIGNUM code. Support for new engines: Broadcom ubsec, Accelerated Encryption Processing, IBM 4758. A few new engines added in the demos area. Extended and corrected OID (object identifier) table. PRNG: query at more locations for a random device, automatic query for EGD style random sources at several locations. SSL/TLS: allow optional cipher choice according to server's preference. SSL/TLS: allow server to explicitly set new session ids. SSL/TLS: support Kerberos cipher suites (RFC2712). Only supports MIT Kerberos for now. SSL/TLS: allow more precise control of renegotiations and sessions. SSL/TLS: add callback to retrieve SSL/TLS messages. SSL/TLS: support AES cipher suites (RFC3268). Major changes between OpenSSL 0.9.6j and OpenSSL 0.9.6k [30 Sep 2003]: Security: fix various ASN1 parsing bugs. SSL/TLS protocol fix for unrequested client certificates. Major changes between OpenSSL 0.9.6i and OpenSSL 0.9.6j [10 Apr 2003]: Security: counter the Klima-Pokorny-Rosa extension of Bleichbacher's attack Security: make RSA blinding default. Build: shared library support fixes. Major changes between OpenSSL 0.9.6h and OpenSSL 0.9.6i [19 Feb 2003]: Important security related bugfixes. Major changes between OpenSSL 0.9.6g and OpenSSL 0.9.6h [5 Dec 2002]: New configuration targets for Tandem OSS and A/UX. New OIDs for Microsoft attributes. Better handling of SSL session caching. Better comparison of distinguished names. Better handling of shared libraries in a mixed GNU/non-GNU environment. Support assembler code with Borland C. Fixes for length problems. Fixes for uninitialised variables. Fixes for memory leaks, some unusual crashes and some race conditions. Fixes for smaller building problems. Updates of manuals, FAQ and other instructive documents. Major changes between OpenSSL 0.9.6f and OpenSSL 0.9.6g [9 Aug 2002]: Important building fixes on Unix. Major changes between OpenSSL 0.9.6e and OpenSSL 0.9.6f [8 Aug 2002]: Various important bugfixes. Major changes between OpenSSL 0.9.6d and OpenSSL 0.9.6e [30 Jul 2002]: Important security related bugfixes. Various SSL/TLS library bugfixes. Major changes between OpenSSL 0.9.6c and OpenSSL 0.9.6d [9 May 2002]: Various SSL/TLS library bugfixes. Fix DH parameter generation for 'non-standard' generators. Major changes between OpenSSL 0.9.6b and OpenSSL 0.9.6c [21 Dec 2001]: Various SSL/TLS library bugfixes. BIGNUM library fixes. RSA OAEP and random number generation fixes. Object identifiers corrected and added. Add assembler BN routines for IA64. Add support for OS/390 Unix, UnixWare with gcc, OpenUNIX 8, MIPS Linux; shared library support for Irix, HP-UX. Add crypto accelerator support for AEP, Baltimore SureWare, Broadcom and Cryptographic Appliance's keyserver [in 0.9.6c-engine release]. Major changes between OpenSSL 0.9.6a and OpenSSL 0.9.6b [9 Jul 2001]: Security fix: PRNG improvements. Security fix: RSA OAEP check. Security fix: Reinsert and fix countermeasure to Bleichbacher's attack. MIPS bug fix in BIGNUM. Bug fix in "openssl enc". Bug fix in X.509 printing routine. Bug fix in DSA verification routine and DSA S/MIME verification. Bug fix to make PRNG thread-safe. Bug fix in RAND_file_name(). Bug fix in compatibility mode trust settings. Bug fix in blowfish EVP. Increase default size for BIO buffering filter. Compatibility fixes in some scripts. Major changes between OpenSSL 0.9.6 and OpenSSL 0.9.6a [5 Apr 2001]: Security fix: change behavior of OpenSSL to avoid using environment variables when running as root. Security fix: check the result of RSA-CRT to reduce the possibility of deducing the private key from an incorrectly calculated signature. Security fix: prevent Bleichenbacher's DSA attack. Security fix: Zero the premaster secret after deriving the master secret in DH ciphersuites. Reimplement SSL_peek(), which had various problems. Compatibility fix: the function des_encrypt() renamed to des_encrypt1() to avoid clashes with some Unixen libc. Bug fixes for Win32, HP/UX and Irix. Bug fixes in BIGNUM, SSL, PKCS#7, PKCS#12, X.509, CONF and memory checking routines. Bug fixes for RSA operations in threaded environments. Bug fixes in misc. openssl applications. Remove a few potential memory leaks. Add tighter checks of BIGNUM routines. Shared library support has been reworked for generality. More documentation. New function BN_rand_range(). Add "-rand" option to openssl s_client and s_server. Major changes between OpenSSL 0.9.5a and OpenSSL 0.9.6 [10 Oct 2000]: Some documentation for BIO and SSL libraries. Enhanced chain verification using key identifiers. New sign and verify options to 'dgst' application. Support for DER and PEM encoded messages in 'smime' application. New 'rsautl' application, low level RSA utility. MD4 now included. Bugfix for SSL rollback padding check. Support for external crypto devices . Enhanced EVP interface.  The support for external crypto devices is currently a separate distribution. See the file README.ENGINE. Major changes between OpenSSL 0.9.5 and OpenSSL 0.9.5a [1 Apr 2000]: Bug fixes for Win32, SuSE Linux, NeXTSTEP and FreeBSD 2.2.8 Shared library support for HPUX and Solaris-gcc Support of Linux/IA64 Assembler support for Mingw32 New 'rand' application New way to check for existence of algorithms from scripts Major changes between OpenSSL 0.9.4 and OpenSSL 0.9.5 [25 May 2000]: S/MIME support in new 'smime' command Documentation for the OpenSSL command line application Automation of 'req' application Fixes to make s_client, s_server work under Windows Support for multiple fieldnames in SPKACs New SPKAC command line utilty and associated library functions Options to allow passwords to be obtained from various sources New public key PEM format and options to handle it Many other fixes and enhancements to command line utilities Usable certificate chain verification Certificate purpose checking Certificate trust settings Support of authority information access extension Extensions in certificate requests Simplified X509 name and attribute routines Initial (incomplete) support for international character sets New DH_METHOD, DSA_METHOD and enhanced RSA_METHOD Read only memory BIOs and simplified creation function TLS/SSL protocol bugfixes: Accept TLS 'client hello' in SSL 3.0 record; allow fragmentation and interleaving of handshake and other data TLS/SSL code now "tolerates" MS SGC Work around for Netscape client certificate hang bug RSA_NULL option that removes RSA patent code but keeps other RSA functionality Memory leak detection now allows applications to add extra information via a per-thread stack PRNG robustness improved EGD support BIGNUM library bug fixes Faster DSA parameter generation Enhanced support for Alpha Linux Experimental MacOS support Major changes between OpenSSL 0.9.3 and OpenSSL 0.9.4 [9 Aug 1999]: Transparent support for PKCS#8 format private keys: these are used by several software packages and are more secure than the standard form PKCS#5 v2.0 implementation Password callbacks have a new void * argument for application data Avoid various memory leaks New pipe-like BIO that allows using the SSL library when actual I/O must be handled by the application (BIO pair) Major changes between OpenSSL 0.9.2b and OpenSSL 0.9.3 [24 May 1999]: Lots of enhancements and cleanups to the Configuration mechanism RSA OEAP related fixes Added `openssl ca -revoke' option for revoking a certificate Source cleanups: const correctness, type-safe stacks and ASN.1 SETs Source tree cleanups: removed lots of obsolete files Thawte SXNet, certificate policies and CRL distribution points extension support Preliminary (experimental) S/MIME support Support for ASN.1 UTF8String and VisibleString Full integration of PKCS#12 code Sparc assembler bignum implementation, optimized hash functions Option to disable selected ciphers Major changes between OpenSSL 0.9.1c and OpenSSL 0.9.2b [22 Mar 1999]: Fixed a security hole related to session resumption Fixed RSA encryption routines for the p < q case "ALL" in cipher lists now means "everything except NULL ciphers" Support for Triple-DES CBCM cipher Support of Optimal Asymmetric Encryption Padding (OAEP) for RSA First support for new TLSv1 ciphers Added a few new BIOs (syslog BIO, reliable BIO) Extended support for DSA certificate/keys. Extended support for Certificate Signing Requests (CSR) Initial support for X.509v3 extensions Extended support for compression inside the SSL record layer Overhauled Win32 builds Cleanups and fixes to the Big Number (BN) library Support for ASN.1 GeneralizedTime Splitted ASN.1 SETs from SEQUENCEs ASN1 and PEM support for Netscape Certificate Sequences Overhauled Perl interface Lots of source tree cleanups. Lots of memory leak fixes. Lots of bug fixes. Major changes between SSLeay 0.9.0b and OpenSSL 0.9.1c [23 Dec 1998]: Integration of the popular NO_RSA/NO_DSA patches Initial support for compression inside the SSL record layer Added BIO proxy and filtering functionality Extended Big Number (BN) library Added RIPE MD160 message digest Addeed support for RC2/64bit cipher Extended ASN.1 parser routines Adjustations of the source tree for CVS Support for various new platforms