[ GLSA 200902-02 ] OpenSSL: Certificate validation error

[GLSA]

Gentoo Linux Security Advisory

Title: OpenSSL: Certificate validation error (GLSA 200902-02)
Severity: normal
Exploitable: remote
Date: February 12, 2009
Bug(s): #251346
ID: 200902-02

Synopsis

An error in the OpenSSL certificate chain validation might allow for spoofing attacks.

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: < 0.9.8j
Unaffected: >= 0.9.8j
Architectures: All supported architectures


Description

The Google Security Team reported that several functions incorrectly check the result after calling the EVP_VerifyFinal() function, allowing a malformed signature to be treated as a good signature rather than as an error. This issue affects the signature checks on DSA and ECDSA keys used with SSL/TLS.

Impact

A remote attacker could exploit this vulnerability and spoof arbitrary names to conduct Man-In-The-Middle attacks and intercept sensitive information.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL users should upgrade to the latest version: