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Insecure Library Loading
Moderately critical

lighttpd Weakness and Vulnerabilities

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Release Date:  2008-09-29    Last Update:  2008-10-03    Views:  7,576

Secunia Advisory SA32069

Where:

From remote

Impact:

Security Bypass, Exposure of sensitive information, DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


A weakness and two vulnerabilities have been reported in lighttpd, which can be exploited by malicious people to disclose potentially sensitive information, bypass certain security restrictions, and cause a DoS (Denial of Service).

1) A vulnerability is caused due to a memory leak within the "http_request_parse()" function when processing duplicate request headers and can be exploited to exhaust all available memory.

2) A vulnerability is caused due to the "mod_userdir" module not correctly handling filenames on case insensitive file systems. This can be exploited to e.g. disclose potentially sensitive information by sending requests with mixed upper and lowercase characters.

3) A weakness is caused due to lighttpd not decoding requests before matching them with rewrite and redirect rules. This can be exploited to e.g. bypass the rewrite and redirect rules.

The weakness and the vulnerabilities are reported in versions prior to 1.4.20.


Solution:
Update to version 1.4.20.

Provided and/or discovered by:
1) Reported by qhy in a lighttpd ticket.
2) Reported by anders1 in a lighttpd ticket.
3) Reported by gaetan.bisson in a lighttpd ticket.

Original Advisory:
1) http://trac.lighttpd.net/trac/ticket/1774
http://www.lighttpd.net/security/lighttpd_sa_2008_07.txt
2) http://www.lighttpd.net/security/lighttpd_sa_2008_06.txt
3) http://www.lighttpd.net/security/lighttpd_sa_2008_05.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 Weakness and Vulnerabilities

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