OpenSSL: Certificate validation error — GLSA 200902-02

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

Affected Packages

dev-libs/openssl on all architectures
Affected versions < 0.9.8j
Unaffected versions >= 0.9.8j

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

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:

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

References

Release Date
February 12, 2009

Latest Revision
February 12, 2009: 01

Severity
normal

Exploitable
remote

Bugzilla entries