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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
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