Technical Description

Two vulnerabilities have been identified in Lighttpd, which could be exploited by remote attackers to cause a denial of service.

The first issue is caused by an infinite loop error in the "connection_handle_read_state()" [connections.c] function when handling a client connection abort while parsing the "\r\n\r\n" sequence, which could be exploited by remote attackers to crash an affected server or exhaust all available memory resources, creating a denial of service condition.

The second vulnerability is caused by a NULL pointer dereference error in "server.c" when processing a file with a "mtime" of 0, which could be exploited by an attacker who is able to upload a file or manipulate the "mtime" to crash an affected server.

Affected Products

Lighttpd versions 1.x

Solution

Upgrade to Lighttpd version 1.4.15 :
http://www.lighttpd.net/download

Or apply patches :
http://www.lighttpd.net/assets/2007/4/13/lighttpd-1.4.x_crlf_parsing_dos.patch
http://www.lighttpd.net/assets/2007/4/13/lighttpd-1.4.x_zero_mtime_crash.patch

References

http://www.vupen.com/english/advisories/2007/1399
http://www.lighttpd.net/assets/2007/4/13/lighttpd_sa2007_01.txt
http://www.lighttpd.net/assets/2007/4/13/lighttpd_sa2007_02.txt

Credits

Vulnerabilities reported by Robert Jakabosky and cubiq.

ChangeLog

2007-04-16 : Initial release

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