20725 : NetBSD Verified exec Failure
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
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Timeline

Disclosure Date
2005-10-31

Description

NetBSD contains a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is triggered when verified exec allows a malicious user to execute specially crafted binaries. This flaw may lead to a loss of integrity.

Classification

Location: Local Access Required
Attack Type: Input Manipulation
Impact: Loss of Integrity
Disclosure: OSVDB Verified

Technical

Verified exec uses the namei interface. The namei interface is used to convert pathnames to file system vnodes. The namei interface contains a function named NDINIT, which initialises a nameidata structure pointed to by ndp for use by the namei interface. The NDINIT function fails to use UIO_SYSSPACE. As a result, characters are copied from a user address rather than a kernel address.

Specifically, in the verifiedexecioctl() function in sys/dev/verified_exec.c, UIO_USERSPACE should have been UIO_SYSSPACE.

Solution

Upgrade to version 2.0.3 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

NetBSD Foundation, Inc.	NetBSD	2.0
		2.0.1
		2.0.2

References

Security Tracker: 1015132
CVE ID: 2005-4779 (see also: NVD)
Related OSVDB ID: 20726 20727 20728 20729 20730 20731
Vendor Specific Advisory URL: http://mail-index.netbsd.org/netbsd-announce/2005/10/31/0000.html
Vendor URL: http://www.netbsd.org/
Other Advisory URL: http://www.uniras.gov.uk/niscc/docs/br-20051101-00969.html?lang=en

Credit

Unknown or Incomplete

CVSSv2 Score

CVSSv2 Base Score = 3.6
Source: nvd.nist.gov | Generated: 2006-04-28 | Disagree?

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