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Debian: Security update for lighttpd

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. Updated packages are available from security.debian.org.

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- ---------------------------------------------------------------------------
Debian Security Advisory DSA-2368-1                     security@debian.org
http://www.debian.org/security/                                  Nico Golde
Dec 20th, 2011                           http://www.debian.org/security/faq
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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.

CVE-2011-4362

 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.

CVE-2011-3389

 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/

Mailing list: debian-security-announce@lists.debian.org

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