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[ GLSA 200806-08 ] OpenSSL: Denial of Service
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PostPosted: Mon Jun 23, 2008 11:26 pm    Post subject: [ GLSA 200806-08 ] OpenSSL: Denial of Service Reply with quote

Gentoo Linux Security Advisory

Title: OpenSSL: Denial of Service (GLSA 200806-08)
Severity: normal
Exploitable: remote
Date: June 23, 2008
Bug(s): #223429
ID: 200806-08

Synopsis

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

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.

Affected Packages

Package: dev-libs/openssl
Vulnerable: < 0.9.8g-r2
Unaffected: >= 0.9.8g-r2
Unaffected: < 0.9.8f
Architectures: All supported architectures


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.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.8g-r2"


References

CVE-2008-0891
CVE-2008-1672
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