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OpenSSL: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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.


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).


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


There is no known workaround at this time.


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


Page updated June 23, 2008

Summary: This is a Gentoo Linux Security Advisory

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