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TITLE:
Pico Server Directory Traversal and Buffer Overflow

SECUNIA ADVISORY ID:
SA15663

VERIFY ADVISORY:
http://secunia.com/advisories/15663/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, Exposure of sensitive information, System access

WHERE:
>From remote

SOFTWARE:
Pico Server (pServ) 3.x
http://secunia.com/product/2672/

DESCRIPTION:
Raphaël Rigo has reported some vulnerabilities in Pico Server, which
can be exploited by malicious people to disclose sensitive
information, bypass certain security restrictions and potentially
compromise a vulnerable system.

1) An input validation error in the URL request handling can be
exploited to disclose arbitrary files outside the web root via
directory traversals attacks via the "/./../" sequence.

This can further be exploited to execute arbitrary local programs by
prefixing the path with "/cgi-bin/".

This is related to vulnerability #1 in:
SA15387

2) Some boundary errors in the CGI argument handling can be exploited
to cause heap-based buffer overflows via overly long CGI arguments
(more than 128 on Linux).

Successful exploitation may allow execution of arbitrary code.

The vulnerabilities have been reported in version 3.3. Prior versions
may also be affected.

SOLUTION:
Update to version 3.4.
http://sourceforge.net/project/showfiles.php?group_id=59378

PROVIDED AND/OR DISCOVERED BY:
Raphaël Rigo

OTHER REFERENCES:
SA15387:
http://secunia.com/advisories/15387/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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