Updated OpenSSL packages that fix a remote denial of service vulnerability
are now available for CentOS Linux 2.1
This update has been rated as having important security impact by the Red
Hat Security Response Team.
The OpenSSL toolkit implements Secure Sockets Layer (SSL v2/v3),
Transport Layer Security (TLS v1) protocols, and serves as a full-strength
general purpose cryptography library.
Testing performed by the OpenSSL group using the Codenomicon TLS Test Tool
uncovered a null-pointer assignment in the do_change_cipher_spec()
function. A remote attacker could perform a carefully crafted SSL/TLS
handshake against a server that uses the OpenSSL library in such a way as
to cause OpenSSL to crash. Depending on the server this could lead to a
denial of service. (CVE-2004-0079)
This issue was reported as not affecting OpenSSL versions prior to 0.9.6c,
and testing with the Codenomicon Test Tool showed that OpenSSL 0.9.6b as
shipped in CentOS Linux 2.1 did not crash. However, an
alternative reproducer has been written which shows that this issue does
affect versions of OpenSSL prior to 0.9.6c.
Users of OpenSSL are advised to upgrade to these updated packages, which
contain a patch provided by the OpenSSL group that protects against this issue.
NOTE: Because server applications are affected by this issue, users are
advised to either restart all services that use OpenSSL functionality or
restart their systems after installing these updates.