16033 : FreeBSD Kernel /dev/null File Descriptor Handling Local Privilege Escalation
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Timeline

Disclosure Date
2002-07-31

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 Public

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

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

References

CVE ID: 2002-0820 (see also: NVD)
CERT VU: 809347
ISS X-Force ID: 8920
Vendor Specific Advisory URL: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc http://www.juniper.net/alerts/viewalert.jsp?actionBtn=Search&txtAlertNumber=FA-SW-0204-004&viewMode=view [ Auth Req'd ]
Other Advisory URL: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&frame=right&th=d429cd2ef1d3a2b7&seekm=ai6c0q%242289%241%40FreeBSD.csie.NCTU.edu.tw#link16
http://www.guninski.com/freebsd2.html
Vendor Specific Solution URL: ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:23/stdio.patch.v1.2 ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:23/stdio.patch.v1.2.asc ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:23/stdio2.patch.v1.2 ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:23/stdio2.patch.v1.2.asc
Mail List Post: http://archives.neohapsis.com/archives/vulnwatch/2002-q3/0047.html
http://marc.theaimsgroup.com/?l=bugtraq&m=102979180524452&w=2
Generic Informational URL: http://groups.google.com/group/mailing.freebsd.cvs-current/browse_thread/thread/4d977e9add75bbec?hl=en&lr=&ie=UTF-8&oe=UTF-8&frame=right&seekm=ai6c0q%242289%241%40FreeBSD.csie.NCTU.edu.tw
Generic Exploit URL: http://marc.theaimsgroup.com/?l=bugtraq&m=102979180524452&w=2

Credit

Joost Pol - joostpine.nl -
Georgi Guninski - guninskiguninski.com - Personal Page

CVSSv2 Score

CVSSv2 Base Score = 7.2
Source: nvd.nist.gov | Generated: 2003-12-31 | Disagree?

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