Georgi Guninski has discovered a vulnerability in mod_ssl, which potentially can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the "ssl_util_uuencode_binary()" function when handling client certificates. This can potentially be exploited to cause a stack-based buffer overflow by sending a specially crafted client certificate containing an overly long subject DN (more than 6KB).
Successful exploitation requires that the "FakeBasicAuth" option is enabled and that the malicious client certificate is issued from a trusted CA (Certificate Authority).
Solution: Update to version 2.8.18 for Apache 1.3.31:
Do you have additional information related to this advisory?
Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this
information to firstname.lastname@example.org