OpenSSL: Timing-based attacks on SSL/TLS with CBC encryption (CVE-2003-0078) (Linux)

OpenSSL is prone to timing-based attacks on SSL/TLS with CBC encryption.

ssl3_get_record in s3_pkt.c for OpenSSL does not perform a MAC computation if an incorrect block cipher padding is used, which causes an information leak (timing discrepancy) that may make it easier to launch cryptographic attacks that rely on distinguishing between padding and MAC verification errors, possibly leading to extraction of the original plaintext, aka the 'Vaudenay timing attack'.

OpenSSL version 0.9.6 through 0.9.6h and 0.9.7.

Checks if a vulnerable version is present on the target host.

Update OpenSSL to version 0.9.6.i, 0.9.7a or later. See the references for more details.