TITLE:
Weex "log_flush()" Format String Vulnerability

SECUNIA ADVISORY ID:
SA17028

VERIFY ADVISORY:
http://secunia.com/advisories/17028/

CRITICAL:
Less critical

IMPACT:
DoS, System access

WHERE:
>From local network

SOFTWARE:
Weex 2.x
http://secunia.com/product/5791/

DESCRIPTION:
Emanuel Haupt has reported a vulnerability in Weex, which potentially
can be exploited by malicious users to cause a DoS (Denial of Service)
or to compromise a vulnerable system.

The vulnerability is caused due to a format string error in the
"log_flush()" function when flushing an error log entry that contains
format string specifiers to disk. This may be exploited to execute
arbitrary code on a user's system via a directory name containing
format string specifiers.

Successful exploitation requires that the attacker is able to create
directories within the user's Weex home directory.

The vulnerability has been reported in version 2.6.1.5. Other
versions may also be affected.

SOLUTION:
Restrict use to trusted servers only.

PROVIDED AND/OR DISCOVERED BY:
Emanuel Haupt

ORIGINAL ADVISORY:
http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/86833

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