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TITLE:
OpenBSD libc fts Nested Directories Denial of Service

SECUNIA ADVISORY ID:
SA34157

VERIFY ADVISORY:
http://secunia.com/advisories/34157/

DESCRIPTION:
A vulnerability has been reported in OpenBSD, which can be exploited
by malicious, local users to cause a DoS (Denial of Service).

The vulnerability is caused due to an integer overflow within the
"fts_build()" function in src/lib/libc/gen/fts.c when processing
deeply nested directories. This can be exploited to crash
applications using certain fts routines (e.g. "rm", "du", "chgrp",
and "chown") via specially crafted directory trees.

The vulnerability is reported in version 4.3 and 4.4. Other versions
may also be affected.

SOLUTION:
Fixed in the CVS repository.
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gen/fts.c.diff?r1=1.41;r2=1.42

PROVIDED AND/OR DISCOVERED BY:
Maksymilian Arciemowicz, SecurityReason

ORIGINAL ADVISORY:
http://securityreason.com/achievement_securityalert/60

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