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TITLE:
Network Security Services SSLv2 Processing Buffer Overflows

SECUNIA ADVISORY ID:
SA24253

VERIFY ADVISORY:
http://secunia.com/advisories/24253/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Network Security Services (NSS) 3.x
http://secunia.com/product/3173/

DESCRIPTION:
Two vulnerabilities have been reported in Network Security Services
(NSS), which potentially can be exploited by malicious people to
compromise a vulnerable system.

1) An integer underflow error when processing SSLv2 server messages
can be exploited to cause a heap-based buffer overflow via a
certificate with a public key too small to encrypt the "Master
Secret".

2) An integer underflow error when processing SSLv2 client master
keys can be exploited to cause a stack-based buffer overflow via
specially crafted parameters during an SSLv2 handshake.

Successful exploitation of the vulnerabilities may allow execution of
arbitrary code.

The vulnerabilities are reported in versions 3.10 and 3.11.3. Other
versions may also be affected.

SOLUTION:
The vulnerabilities will be fixed in version 3.11.5.

PROVIDED AND/OR DISCOVERED BY:
Discovered by regenrecht and reported via iDefense Labs.

ORIGINAL ADVISORY:
Mozilla Foundation:
http://www.mozilla.org/security/announce/2007/mfsa2007-06.html

iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=482
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=483

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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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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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