3836 : Multiple BSD shmat() Privilege Escalation
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
5	741	over 8 years ago	over 4 years ago	0 times	90%

Timeline

Discovery Date	Disclosure Date
2004-02-01	2004-02-05

Description

BSD contains a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is triggered when two separate mappings are created with shmat(2) to a shared memory segment created with shmget(2). If shmat(2) is abused and then one of the mappings delected with shmdt(2) the vm_object will continue to map to the shared memory segment. An suid binary may reuse the vm_object and allow the (non-root) user to write directly to the stack segment of the suid binary. This flaw may lead to a loss of integrity of the system.

Classification

Location: Local Access Required
Attack Type: Infrastructure
Impact: Loss of Integrity
Exploit: Exploit Rumored
OSVDB: Web Related

Solution

Upgrade to the current slice the BSD distribution as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing vendor supplied patches.

Products

FreeBSD Project	FreeBSD	2.2.0
		4.0
		5.0

NetBSD Foundation, Inc.

NetBSD

1.3

OpenBSD	OpenBSD	2.6
		3.3
		3.4

References

Secunia Advisory ID: 10806
CVE ID: 2004-0114 (see also: NVD)
Vendor Specific Solution URL: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-04:02/shmat.patch ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.3/common/015_sysvshm.patch ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.4/common/010_sysvshm.patch
Vendor Specific Advisory URL: ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2004-004.txt.asc
Other Advisory URL: http://www.pine.nl/press/pine-cert-20040201.txt

Tools & Filters

	12614

Credit

Unknown or Incomplete

CVSSv2 Score

CVSSv2 Base Score = 4.6
Source: nvd.nist.gov | Generated: 2003-12-31 | Disagree?

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