Debian Security Advisory DSA-2368-1 email@example.com http://www.debian.org/security/ Nico Golde Dec 20th, 2011 http://www.debian.org/security/faq
Package : lighttpd Vulnerability : multiple Problem type : remote Debian-specific: no Debian bug : 652726 CVE IDs : CVE-2011-4362 CVE-2011-3389
Several vulnerabilities have been discovered in lighttpd, a small and fast webserver with minimal memory footprint.
Xi Wang discovered that the base64 decoding routine which is used to decode user input during an HTTP authentication, suffers of a signedness issue when processing user input. As a result it is possible to force lighttpd to perform an out-of-bounds read which results in Denial of Service conditions.
When using CBC ciphers on an SSL enabled virtual host to communicate with certain client, a so called "BEAST" attack allows man-in-the-middle attackers to obtain plaintext HTTP traffic via a blockwise chosen-boundary attack (BCBA) on an HTTPS session. Technically this is no lighttpd vulnerability. However, lighttpd offers a workaround to mitigate this problem by providing a possibility to disable CBC ciphers.
This updates includes this option by default. System administrators are advised to read the NEWS file of this update (as this may break older clients).
For the oldstable distribution (lenny), this problem has been fixed in version 1.4.19+lenny3.
For the stable distribution (squeeze), this problem has been fixed in version 1.4.28-2+squeeze1.
For the testing distribution (squeeze), this problem will be fixed soon.
For the unstable distribution (sid), this problem has been fixed in version 1.4.30-1.
We recommend that you upgrade your lighttpd packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: http://www.debian.org/security/
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