Multiple BSD systems strfmon() integer overflow
| bsd-strfmon-overflow (41504) |  High Risk |
Description:
Multiple BSD systems are vulnerable to multiple integer overflows, caused by improper bounds checking by the strfmon() function in the libc library. By sending a specially-crafted value containing malicious format specifiers, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the system to crash.
Platforms Affected:
- FreeBSD, FreeBSD 6.0
- FreeBSD, FreeBSD 7.0
- NetBSD, NetBSD 4.0
Remedy:
For NetBSD:
Apply the fix, available from the NetBSD CVS Repository. See References.
Consequences:
Gain Access
References:
- BugTraq Mailing List, Thu Mar 27 2008 - 09:09:49 CDT, [securityreason] *BSD libc (strfmon) Multiple vulnerabilities at http://archives.neohapsis.com/archives/bugtraq/2008-03/0406.html.
- FreeBSD Web site, FreeBSD at http://www.freebsd.org/.
- GNU Web site, GNU C Library at http://www.gnu.org/software/libc/.
- NetBSD CVS Repository, CVS log for src/lib/libc/stdlib/strfmon.c at http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdlib/strfmon.c.
- BID-28479: Multiple BSD Platforms 'strfmon()' Function Integer Overflow Weakness
- CVE-2008-1391: Multiple integer overflows in libc in NetBSD 4.x, FreeBSD 6.x and 7.x, and probably other BSD and Apple Mac OS platforms allow context-dependent attackers to execute arbitrary code via large values of certain integer fields in the format argument to (1) the strfmon function in lib/libc/stdlib/strfmon.c, related to the GET_NUMBER macro; and (2) the printf function, related to left_prec and right_prec.
- SA29574: FreeBSD "strfmon()" Multiple Integer Overflows
- SECTRACK ID: 1019722: libc strfmon() Integer Overflows May Let Users Execute Arbitrary Code
Reported:
Mar 27, 2008
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