L4teral has discovered some vulnerabilities in Sarg, which can be exploited by malicious people to conduct script insertion attacks or to compromise a vulnerable system.
1) A boundary error exists within the "useragent()" function in useragent.c. This can be exploited to cause a stack-based buffer overflow via an overly long User-Agent header sent to a Squid proxy server.
Successful exploitation allows execution of arbitrary code.
2) Input passed via the User-Agent header to a Squid proxy server is not properly sanitised before being used to generate HTML reports. This can be exploited to insert arbitrary HTML and script code, which is executed in a user's browser session in context of an affected site when the malicious logs are viewed.
Successful exploitation of the vulnerabilities requires that processing support for Squid User-Agent logs is enabled.
The vulnerabilities are confirmed in version 18.104.22.168. Other versions may also be affected.
Solution: Update to version 2.2.5.
Provided and/or discovered by: L4teral
Original Advisory: Sarg:
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 firstname.lastname@example.org