Test ID:	1.3.6.1.4.1.25623.1.0.112912
Category:	General
Title:	OpenSSL: Timing-based attacks on SSL/TLS with CBC encryption (CVE-2003-0078) - Linux
Summary:	OpenSSL is prone to timing-based attacks on SSL/TLS with CBC encryption.
Description:	Summary: OpenSSL is prone to timing-based attacks on SSL/TLS with CBC encryption. Vulnerability Insight: ssl3_get_record in s3_pkt.c for OpenSSL does not perform a MAC computation if an incorrect block cipher padding is used, which causes an information leak (timing discrepancy) that may make it easier to launch cryptographic attacks that rely on distinguishing between padding and MAC verification errors, possibly leading to extraction of the original plaintext, aka the 'Vaudenay timing attack'. Vulnerability Impact: An active attacker can substitute specifically made-up ciphertext blocks for blocks sent by legitimate SSL/TLS parties and measure the time until a response arrives: SSL/TLS includes data authentication to ensure that such modified ciphertext blocks will be rejected by the peer (and the connection aborted), but the attacker may be able to use timing observations to distinguish between two different error cases, namely block cipher padding errors and MAC verification errors. This is sufficient for an adaptive attack that finally can obtain the complete plaintext block. Affected Software/OS: OpenSSL version 0.9.6 through 0.9.6h and 0.9.7. Solution: Update to version 0.9.6.i, 0.9.7a or later. See the references for more details. CVSS Score: 5.0 CVSS Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2003-0078 BugTraq ID: 6884 http://www.securityfocus.com/bid/6884 Bugtraq: 20030219 OpenSSL 0.9.7a and 0.9.6i released (Google Search) http://marc.info/?l=bugtraq&m=104567627211904&w=2 Bugtraq: 20030219 [OpenPKG-SA-2003.013] OpenPKG Security Advisory (openssl) (Google Search) http://marc.info/?l=bugtraq&m=104568426824439&w=2 Computer Incident Advisory Center Bulletin: N-051 http://www.ciac.org/ciac/bulletins/n-051.shtml Conectiva Linux advisory: CLSA-2003:570 http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000570 Debian Security Information: DSA-253 (Google Search) http://www.debian.org/security/2003/dsa-253 En Garde Linux Advisory: ESA-20030220-005 http://www.linuxsecurity.com/advisories/engarde_advisory-2874.html FreeBSD Security Advisory: FreeBSD-SA-03:02 http://marc.info/?l=bugtraq&m=104577183206905&w=2 http://www.mandrakesoft.com/security/advisories?name=MDKSA-2003:020 NETBSD Security Advisory: NetBSD-SA2003-001 ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2003-001.txt.asc http://www.osvdb.org/3945 http://www.redhat.com/support/errata/RHSA-2003-062.html http://www.redhat.com/support/errata/RHSA-2003-063.html http://www.redhat.com/support/errata/RHSA-2003-082.html http://www.redhat.com/support/errata/RHSA-2003-104.html http://www.redhat.com/support/errata/RHSA-2003-205.html SGI Security Advisory: 20030501-01-I ftp://patches.sgi.com/support/free/security/advisories/20030501-01-I SuSE Security Announcement: SuSE-SA:2003:011 (Google Search) http://www.trustix.org/errata/2003/0005 http://www.iss.net/security_center/static/11369.php
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