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Insecure Library Loading
Moderately critical

lighttpd "mtime" and "\r\n\r\n\" Denial of Service Vulnerabilities

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Release Date:  2007-04-16    Views:  14,632

Secunia Advisory SA24886

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in lighttpd, which can be exploited by malicious users and malicious people to cause a DoS (Denial of Service).

1) An error exists during the parsing of the "\r\n\r\n" sequence. This can be exploited to cause an infinite loop by aborting the connection while the server parses the sequence, which e.g. results in a high CPU load and exhaustion of system resources .

2) An NULL pointer dereference exists within the mtime handling of files. This can be exploited to cause a crash by requesting a file with mtime 0.

Successful exploitation requires that the attacker can request or upload files with mtime 0, or can otherwise modify the mtime of files.

Vulnerability #1 is reported in version 1.4.12 and 1.4.13. Vulnerability #2 is reported in the 1.4.x branch and probably also affects the 1.3.x branch. Other versions may also be affected.


Solution:
Update to version 1.4.15 or apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Robert Jakabosky
2) cubiq

Original Advisory:
http://www.lighttpd.net/assets/2007/4/13/lighttpd_sa2007_01.txt
http://www.lighttpd.net/assets/2007/4/13/lighttpd_sa2007_02.txt

Deep Links:
Links available to Secunia VIM customers

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 vuln@secunia.com

Subject: lighttpd "mtime" and "\r\n\r\n\" Denial of Service Vulnerabilities

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