OpenSSL ASN.1 sequence denial of service

openssl-asn1-sequence-dos (13595)

Medium Risk

Description:

OpenSSL, when running on Microsoft Windows, is vulnerable to a denial of service, caused by improper handling of large recursions. By sending a specially-crafted SSL/TLS client certificate containing arbitrary ASN.1 sequences, a remote attacker could cause OpenSSL to crash.

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of OpenSSL (0.9.6l or later or 0.9.7c or later), as listed in OpenSSL Security Advisory [4 November 2003]. See References.

For EnGarde Secure Linux Community Edition and Professional Edition:
Upgrade to the latest openssl package (0.9.6-1.0.22 or later), as listed in Guardian Digital Security Advisory ESA-20031104-029. See References.

For SGI IRIX:
Upgrade to the appropriate fixed packages, as listed in SGI Security Advisory 20030904-02-P. See References.

— OR —

Apply the appropriate patch for your system, as listed in SGI Security Advisory 20031102-02-P. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

• Guardian Digital Security Advisory ESA-20031104-029: ASN.1 parsing denial of service.. (From LinuxSecurity archive)
• OpenSSL Security Advisory [4 November 2003]: Denial of Service in ASN.1 parsing.
• SecuriTeam Mailing List, Security Holes & Exploits 18 Jan 2004: Malformed ASN.1 Exploit Code.
• SGI Security Advisory 20031102-02-P: Multiple OpenSSH/OpenSSL Vulnerabilities Update.
• BID-8970: OpenSSL ASN.1 Large Recursion Remote Denial Of Service Vulnerability
• BID-9074: Apple Mac OS X Jaguar/Panther Multiple Vulnerabilities
• CVE-2003-0851: OpenSSL 0.9.6k allows remote attackers to cause a denial of service (crash via large recursion) via malformed ASN.1 sequences.
• RHSA-2004-119: openssl security update
• US-CERT VU#412478: OpenSSL 0.9.6k does not properly handle ASN.1 sequences

Platforms Affected:

• EngardeLinux Secure Community 1.0.1
• EngardeLinux Secure Community 2.0
• EngardeLinux Secure Professional 1.1
• EngardeLinux Secure Professional 1.2
• EngardeLinux Secure Professional 1.5
• OpenSSL OpenSSL 0.9.6
• OpenSSL OpenSSL 0.9.6a
• OpenSSL OpenSSL 0.9.6b
• OpenSSL OpenSSL 0.9.6c
• OpenSSL OpenSSL 0.9.6d
• OpenSSL OpenSSL 0.9.6e
• OpenSSL OpenSSL 0.9.6f
• OpenSSL OpenSSL 0.9.6g
• OpenSSL OpenSSL 0.9.6h
• OpenSSL OpenSSL 0.9.6i
• OpenSSL OpenSSL 0.9.6j
• OpenSSL OpenSSL 0.9.6k
• OpenSSL OpenSSL 0.9.7
• OpenSSL OpenSSL 0.9.7 Beta6
• OpenSSL OpenSSL 0.9.7 Beta4
• OpenSSL OpenSSL 0.9.7 Beta3
• OpenSSL OpenSSL 0.9.7 Beta1
• OpenSSL OpenSSL 0.9.7 Beta2
• OpenSSL OpenSSL 0.9.7 Beta5
• OpenSSL OpenSSL 0.9.7a
• OpenSSL OpenSSL 0.9.7b
• OpenSSL OpenSSL 0.9.7c
• RedHat Enterprise Linux 2.1 WS
• RedHat Enterprise Linux 2.1 ES
• RedHat Enterprise Linux 2.1 AS
• RedHat Linux Advanced Workstation 2.1 Itanium
• SGI IRIX 6.5
• SGI IRIX 6.5 20
• SGI IRIX 6.5.1
• SGI IRIX 6.5.10
• SGI IRIX 6.5.10f
• SGI IRIX 6.5.10m
• SGI IRIX 6.5.11
• SGI IRIX 6.5.11f
• SGI IRIX 6.5.11m
• SGI IRIX 6.5.12
• SGI IRIX 6.5.12f
• SGI IRIX 6.5.12m
• SGI IRIX 6.5.13
• SGI IRIX 6.5.13f
• SGI IRIX 6.5.13m
• SGI IRIX 6.5.14
• SGI IRIX 6.5.14f
• SGI IRIX 6.5.14m
• SGI IRIX 6.5.15
• SGI IRIX 6.5.15f
• SGI IRIX 6.5.15m
• SGI IRIX 6.5.16
• SGI IRIX 6.5.16f
• SGI IRIX 6.5.16m
• SGI IRIX 6.5.17
• SGI IRIX 6.5.17f
• SGI IRIX 6.5.17m
• SGI IRIX 6.5.18
• SGI IRIX 6.5.18f
• SGI IRIX 6.5.18m
• SGI IRIX 6.5.19
• SGI IRIX 6.5.19f
• SGI IRIX 6.5.19m
• SGI IRIX 6.5.2
• SGI IRIX 6.5.20
• SGI IRIX 6.5.20f
• SGI IRIX 6.5.20m
• SGI IRIX 6.5.21
• SGI IRIX 6.5.21f
• SGI IRIX 6.5.21m
• SGI IRIX 6.5.22
• SGI IRIX 6.5.2f
• SGI IRIX 6.5.2m
• SGI IRIX 6.5.3
• SGI IRIX 6.5.3f
• SGI IRIX 6.5.3m
• SGI IRIX 6.5.4
• SGI IRIX 6.5.4f
• SGI IRIX 6.5.4m
• SGI IRIX 6.5.5
• SGI IRIX 6.5.5f
• SGI IRIX 6.5.5m
• SGI IRIX 6.5.6
• SGI IRIX 6.5.6f
• SGI IRIX 6.5.6m
• SGI IRIX 6.5.7
• SGI IRIX 6.5.7f
• SGI IRIX 6.5.7m
• SGI IRIX 6.5.8
• SGI IRIX 6.5.8f
• SGI IRIX 6.5.8m
• SGI IRIX 6.5.9
• SGI IRIX 6.5.9f
• SGI IRIX 6.5.9m

Reported:

Nov 04, 2003

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