OpenSSL: Denial of Service

Security Team Contact Address

Updated June 23, 2008

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200806-08 / openssl
Release Date	June 23, 2008
Latest Revision	June 23, 2008: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
dev-libs/openssl	< 0.9.8g-r2	>= 0.9.8g-r2, < 0.9.8f	All supported architectures

Related bugreports: #223429

Synopsis

Two vulnerabilities might allow for a Denial of Service of daemons using OpenSSL.

2. Impact Information

Background

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general purpose cryptography library.

Description

Ossi Herrala and Jukka Taimisto of Codenomicon discovered two vulnerabilities:

A double free() call in the TLS server name extension (CVE-2008-0891).
The OpenSSL client code does not properly handle servers that omit the Server Key Exchange message in the TLS handshake (CVE-2008-1672).

Impact

A remote attacker could connect to a vulnerable server, or entice a daemon to connect to a malicious server, causing a Denial of Service of the daemon in both cases.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.8g-r2"

4. References