OpenSSL: Certificate validation error
Gentoo Linux Security Advisory
||GLSA 200902-02 / openssl
||February 12, 2009
||February 12, 2009: 01
All supported architectures
An error in the OpenSSL certificate chain validation might allow for
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.
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.
A remote attacker could exploit this vulnerability and spoof arbitrary
names to conduct Man-In-The-Middle attacks and intercept sensitive
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-0.9.8j"