[UNIX] Off-by-One Error in realpath (FreeBSD)
From: SecuriTeam (support_at_securiteam.com)
Date: 08/05/03
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To: list@securiteam.com Date: 5 Aug 2003 14:05:42 +0200
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Off-by-One Error in realpath (FreeBSD)
------------------------------------------------------------------------
SUMMARY
An off-by-one error exists in the C library function realpath(3). This is
the same bug that was recently found in the
<http://www.securiteam.com/unixfocus/5ZP010AAUI.html> wu-ftpd ftpd server
by Janusz Niewiadomski and Janusz Niewiadomski.
DETAILS
The OpenBSD ftp daemon does not use realpath(3) in a way that could be
exploited, however a number of other system binaries also use the
function. It is not currently known whether this bug results in an
exploitable security hole on OpenBSD. Since the bug led to an exploitable
hole in wu-ftpd, it is entirely possible that some program using
realpath(3) under OpenBSD may be vulnerable to attack. For OpenBSD 3.3
and higher, the ProPolice stack protector should provide some protection
from this bug, but this cannot be guaranteed.
This bug has been fixed in OpenBSD-current as well as the 3.2 and 3.3
stable branches. Patches are available for OpenBSD 3.2 and 3.3.
Patch for OpenBSD 3.2:
<ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.2/common/015_realpath.patch>
ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.2/common/015_realpath.patch
Patch for OpenBSD 3.3:
<ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.3/common/001_realpath.patch>
ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.3/common/001_realpath.patch
For versions of OpenBSD prior to 3.2, users may simply fetch the current
revision of realpath.c from:
<ftp://ftp.OpenBSD.org/pub/OpenBSD/src/lib/libc/stdlib/realpath.c>
ftp://ftp.OpenBSD.org/pub/OpenBSD/src/lib/libc/stdlib/realpath.c then
rebuild and install libc with the new realpath.c.
ADDITIONAL INFORMATION
The information has been provided by <mailto:Todd.Miller@courtesan.com>
Todd C. Miller.
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