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TITLE:
OpenPegasus PAM Module Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA28358

VERIFY ADVISORY:
http://secunia.com/advisories/28358/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

SOFTWARE:
OpenPegasus 2.x
http://secunia.com/product/17112/

DESCRIPTION:
Some vulnerabilities have been reported in OpenPegasus, which can
potentially be exploited by malicious people to compromise a
vulnerable system.

1) A boundary error exists within the
"PAMBasicAuthenticator::PAMCallback()" method and can be exploited to
cause a buffer overflow via an overly long password.

Successful exploitation may allow execution of arbitrary code.

2) A boundary error within the PAM module can be exploited to cause a
buffer overflow and potentially allows execution of arbitrary code.

SOLUTION:
Vulnerability #1 is fixed in the CVS repository.
http://cvs.opengroup.org/cgi-bin/cvsweb.cgi/pegasus/src/Pegasus/Security/Authentication/PAMBasicAuthenticatorUnix.cpp.diff?cvsroot=Pegasus&r1=1.34.4.1&r2=1.34.4.2&f=H&only_with_tag=RELEASE_2_6-branch

Restrict network access to the affected service.

PROVIDED AND/OR DISCOVERED BY:
1) Mark J. Cox, via a Red Hat bug report.
2) Alexander Sotirov from VMware Security Research, reported via a
VMWare advisory.

ORIGINAL ADVISORY:
Red Hat:
https://bugzilla.redhat.com/show_bug.cgi?id=426578

VMware:
http://lists.vmware.com/pipermail/security-announce/2008/000002.html

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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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http://secunia.com/about_secunia_advisories/


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