16033 : FreeBSD Kernel /dev/null File Descriptor Close Issue
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Info

Last Modified
8 months ago

Percent Complete
100%

Disclosure
Jul 31, 2002

Discovery
Unknown

Dates

Exploit
Aug 19, 2002

Solution
Unknown

Description

 FreeBSD contains a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is triggered when the FreeBSD kernel allows a malicious user to direcly supply input to file descriptors during the execution of a setuid or setgid program. This flaw may lead to a loss of integrity.

Classification

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

Solution

 Upgrade to version 4.6-STABLE; or to any of the RELENG_4_6 (4.6.1-RELEASE-p1), RELENG_4_5 (4.5-RELEASE-p10), or RELENG_4_4 (4.4-RELEASE-p17) security branches dated after the respective correction dates, as it has been reported to fix this vulnerability. In addition, FreeBSD has released patches for some older versions.

It is also possible to correct the flaw by implementing the following workarounds: remove the setuid bit from exploitable programs and unmount all instances of the procfs and linprocfs filesystems.

Products
FreeBSD Project
Watch-list
FreeBSD
Watch-list
 3.x
2.x
1.x
4.6-RELEASE
4.6-STABLE
4.0-x
4.1-x
4.2-x
4.3-x
4.4-x
4.5-x

References

Credit
  • Joost Pol - joostBrand New Doo Doopine.nl -
  • Georgi Guninski - guninskiBrand New Doo Dooguninski.com - Personal Page

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