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TITLE:
user-ppp "command_Expand_Interpret()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA29240

VERIFY ADVISORY:
http://secunia.com/advisories/29240/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
user-ppp
http://secunia.com/product/17868/

DESCRIPTION:
sipher has reported a vulnerability in user-ppp, which potentially
can be exploited by malicious, local users to gain escalated
privileges.

The vulnerability is caused due to a boundary error within the
"command_Expand_Interpret()" function in command.c. This can be
exploited to cause a stack-based buffer overflow via a string
containing special characters (.e.g '~').

Successful exploitation requires that the attacker has "network"
group privileges.

The vulnerability is reported in the user-ppp included in FreeBSD
6.3. Other versions may also be affected.

SOLUTION:
Restrict local access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
sipher

ORIGINAL ADVISORY:
http://seclists.org/vuln-dev/2008/Feb/0010.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.

Subscribe:
http://secunia.com/secunia_security_advisories/

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


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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