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Secunia Network Software Inspector 2.0 (NSI) - Public Beta

The Public Beta has ended. Thanks to all that participated.

Learn more:
http://secunia.com/network_software_inspector_2/

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TITLE:
rdesktop Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA30118

VERIFY ADVISORY:
http://secunia.com/advisories/30118/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
rdesktop 1.x
http://secunia.com/product/18590/

DESCRIPTION:
Some vulnerabilities have been reported in rdesktop, which can be
exploited by malicious people to compromise a user's system.

1) An integer underflow error in iso.c when processing RDP requests
can be exploited to cause a heap-based buffer overflow.

2) An input validation error in rdp.c when processing RDP redirect
requests can be exploited to cause a BSS-based buffer overflow.

3) A signedness error within "xrealloc()" in rdesktop.c can be
exploited to cause a heap-based buffer overflow.

Successful exploitation allows execution of arbitrary code but
requires that a user is tricked into connecting to a malicious RDP
server.

The vulnerabilities are reported in version 1.5.0. Other versions may
also be affected.

SOLUTION:
Fixed in the CVS repository.
http://rdesktop.cvs.sourceforge.net/rdesktop/rdesktop/iso.c?annotate=1.20&diff_format=h&pathrev=HEAD#l101
http://rdesktop.cvs.sourceforge.net/rdesktop/rdesktop/rdp.c?annotate=1.102&pathrev=HEAD#l1337
http://rdesktop.cvs.sourceforge.net/rdesktop/rdesktop/rdesktop.c?view=diff&pathrev=HEAD&r1=text&tr1=1.162&r2=text&tr2=1.118&diff_format=h#l1134

PROVIDED AND/OR DISCOVERED BY:
1) Discovered by an anonymous researcher and reported via iDefense
Labs.
2) Discovered by an anonymous researcher and reported via iDefense
Labs.
3) Discovered by an anonymous researcher and reported via iDefense
Labs.

ORIGINAL ADVISORY:
iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=696
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=697
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=698

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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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