NetBSD kernfs kernfs_xread() kernel memory disclosure
| netbsd-kernfs-memory-disclosure (24035) |  Medium Risk |
Description:
Multiple versions of NetBSD and OpenBSD could allow a local attacker to obtain sensitive information, caused by a vulnerability in the kernfs_xread() function. A local attacker could exploit this vulnerability using the lseek() system call to read portions of the kernel memory and possibly gain elevated privileges.
Platforms Affected:
- NetBSD, NetBSD 1.6
- NetBSD, NetBSD 1.6 beta
- NetBSD, NetBSD 1.6.1
- NetBSD, NetBSD 1.6.2
- NetBSD, NetBSD 2.0
- NetBSD, NetBSD 2.0.1
- NetBSD, NetBSD 2.0.2
- NetBSD, NetBSD 2.0.3
- NetBSD, NetBSD 2.1
- OpenBSD, OpenBSD 3.8
Remedy:
Refer to NetBSD Security Advisory 2006-001 for patch or upgrade information. See References.
Consequences:
Obtain Information
References:
- Full-Disclosure Mailing List, Thu Feb 02 2006 - 14:40:47 CST, [SLAB] NetBSD / OpenBSD kernfs_xread patch evasion at http://archives.neohapsis.com/archives/fulldisclosure/2006-02/0012.html.
- NetBSD Security Advisory 2006-001, Kernfs kernel memory disclosure at http://archives.neohapsis.com/archives/bugtraq/2006-01/0116.html.
- BID-16173: Multiple Vendor KernFS LSEEK Local Kernel Memory Disclosure Vulnerability
- CVE-2006-0145: The kernfs_xread function in kernfs in NetBSD 1.6 through 2.1, and OpenBSD 3.8, does not properly validate file offsets against negative 32-bit values that occur as a result of truncation, which allows local users to read arbitrary kernel memory and gain privileges via the lseek system call.
- OSVDB ID: 22293: Multiple BSD kernfs lseek(2) Function Arbitrary Memory Disclosure
- SA18388: NetBSD Kernfs Kernel Memory Disclosure Vulnerability
- SA18712: OpenBSD Kernfs Kernel Memory Disclosure Vulnerability
Reported:
Jan 09, 2006
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