Multiple vendor BSD platforms allows elevated privileges
| bsd-shmat-gain-privileges (15061) |  High Risk |
Description:
Multiple vendor BSD platforms could allow a local attacker to gain elevated privileges on the system, caused by improper incrimination of a shared memory segment's reference count by the shmat function in the System V Shared Memory interface. A local attacker could exploit this vulnerability to obtain sensitive information or gain elevated privileges on the vulnerable system.
Platforms Affected:
- FreeBSD, FreeBSD
- NetBSD, NetBSD 1.5
- NetBSD, NetBSD 1.5.1
- NetBSD, NetBSD 1.5.2
- NetBSD, NetBSD 1.5.3
- NetBSD, NetBSD 1.6
- NetBSD, NetBSD 1.6.1
- OpenBSD, OpenBSD 3.x
Remedy:
For FreeBSD:
Upgrade to the latest version of FreeBSD (RELENG_4, RELENG_5_2, 5.2-RELEASE-p2, RELENG_5_1, 5.1-RELEASE-p14, RELENG_5_0, 5.0-RELEASE-p20, RELENG_4_9, 4.9-RELEASE-p2, RELENG_4_8, 4.8-RELEASE-p15, RELENG_4_7, 4.7-RELEASE-p25), as listed in FreeBSD Security Advisory FreeBSD-SA-04:02.shmat. See References.
For OpenBSD 3.4:
Apply the 010_sysvshm.patch, available from the OpenBSD 3.4 errata Web site. See References.
For OpenBSD 3.3:
Apply the 015_sysvshm.patch, available from the OpenBSD 3.4 errata Web site. See References.
For NetBSD:
Upgrade to the appropriate fixed versions of NetBSD, as listed in NetBSD Security Advisory 2004-004. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
Gain Privileges
References:
- BugTraq Mailing List, Thu Feb 05 2004 - 12:08:39 CST , reference count overflow in shmat() at http://archives.neohapsis.com/archives/bugtraq/2004-02/0141.html.
- FreeBSD Security Advisory FreeBSD-SA-04:02.shmat, shmat reference counting bug at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04:02.shmat.asc.
- NetBSD Security Advisory 2004-004, shmat reference counting bug at http://mail-index.netbsd.org/netbsd-announce/2004/02/19/0003.html.
- OpenBSD 3.3 errata Web site, 015: SECURITY FIX: February 5, 2004 at http://www.openbsd.org/errata33.html#sysvshm.
- OpenBSD 3.4 errata Web site, 010: SECURITY FIX: February 5, 2004 at http://www.openbsd.org/errata.html#sysvshm.
- BID-9586: BSD Kernel SHMAT System Call Privilege Escalation Vulnerability
- CVE-2004-0114: The shmat system call in the System V Shared Memory interface for FreeBSD 5.2 and earlier, NetBSD 1.3 and earlier, and OpenBSD 2.6 and earlier, does not properly decrement a shared memory segment's reference count when the vm_map_find function fails, which could allow local users to gain read or write access to a portion of kernel memory and gain privileges.
- OSVDB ID: 3836: Multiple BSD shmat() Privilege Escalation
Reported:
Feb 05, 2004
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