Linux Kernel Local File Descriptor Passing Security Module Bypass Vulnerability

BID:12168

Info

Linux Kernel Local File Descriptor Passing Security Module Bypass Vulnerability

Bugtraq ID: 12168
Class: Access Validation Error
CVE:
Remote: No
Local: Yes
Published: Jan 05 2005 12:00AM
Updated: Jan 05 2005 12:00AM
Credit: Mitchell Blank Jr <[email protected]> disclosed this vulnerability.
Vulnerable: Redhat Fedora Core3
Redhat Fedora Core2
Linux kernel 2.6.10 rc2
Linux kernel 2.6.9
Linux kernel 2.6.8 rc3
Linux kernel 2.6.8 rc2
Linux kernel 2.6.8 rc1
+ Ubuntu Ubuntu Linux 4.1 ppc
 + Ubuntu Ubuntu Linux 4.1 ia64
 + Ubuntu Ubuntu Linux 4.1 ia32
 Linux kernel 2.6.8
+ S.u.S.E. Linux Personal 9.2 x86_64
 + S.u.S.E. Linux Personal 9.2
+ Ubuntu Ubuntu Linux 4.1 ppc
 + Ubuntu Ubuntu Linux 4.1 ia64
 + Ubuntu Ubuntu Linux 4.1 ia32
 Linux kernel 2.6.7 rc1
Linux kernel 2.6.7
Linux kernel 2.6.6 rc1
Linux kernel 2.6.6
Linux kernel 2.6.5
+ S.u.S.E. Linux Personal 9.1 x86_64
 + S.u.S.E. Linux Personal 9.1 x86_64
 + S.u.S.E. Linux Personal 9.1
+ S.u.S.E. Linux Personal 9.1
+ SuSE Linux Enterprise Server 9
 Linux kernel 2.6.4
Linux kernel 2.6.3
Linux kernel 2.6.2
Linux kernel 2.6.1 -rc2
Linux kernel 2.6.1 -rc1
Linux kernel 2.6.1
Linux kernel 2.6 -test9-CVS
Linux kernel 2.6 -test9
Linux kernel 2.6 -test8
Linux kernel 2.6 -test7
Linux kernel 2.6 -test6
Linux kernel 2.6 -test5
Linux kernel 2.6 -test4
Linux kernel 2.6 -test3
Linux kernel 2.6 -test2
Linux kernel 2.6 -test11
Linux kernel 2.6 -test10
Linux kernel 2.6 -test1
Linux kernel 2.6
Not Vulnerable: Linux kernel 2.6 .10

Discussion

Linux Kernel Local File Descriptor Passing Security Module Bypass Vulnerability

It is reported that in certain cases, the Linux kernel fails to properly call defined security module functions in its SCM system.

This vulnerability may allow local attackers to bypass the expected security measures when passing file descriptors. The exact results of this vulnerability depend on the implementation of applications that utilize file descriptor passing. It is conjectured that this may result in open file descriptors being passed to processes that would not normally be able to access them. This may lead to attackers gaining access to read or modify files that would normally be denied to them.

This vulnerability is reported to exist in the Linux kernel in the 2.6 series, in versions prior to 2.6.10.

Exploit / POC

Linux Kernel Local File Descriptor Passing Security Module Bypass Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

Linux Kernel Local File Descriptor Passing Security Module Bypass Vulnerability

Solution:
Red Hat Linux has released advisories FEDORA-2004-581, and FEDORA-2004-582 to address this, and other issues for Fedora Core 2, and 3 respectively. Please see the referenced advisories for further information.

The vendor has released version 2.6.10 of the Linux kernel to address this issue:


Linux kernel 2.6 -test10

Linux kernel 2.6 -test6

Linux kernel 2.6 -test1

Linux kernel 2.6 -test4

Linux kernel 2.6 -test7

Linux kernel 2.6 -test9-CVS

Linux kernel 2.6

Linux kernel 2.6 -test9

Linux kernel 2.6 -test2

Linux kernel 2.6 -test3

Linux kernel 2.6 -test8

Linux kernel 2.6 -test11

Linux kernel 2.6 -test5

Linux kernel 2.6.1 -rc1

Linux kernel 2.6.1 -rc2

Linux kernel 2.6.1

Linux kernel 2.6.10 rc2

Linux kernel 2.6.2

Linux kernel 2.6.3

Linux kernel 2.6.4

Linux kernel 2.6.5

Linux kernel 2.6.6

Linux kernel 2.6.6 rc1

Linux kernel 2.6.7

Linux kernel 2.6.7 rc1

Linux kernel 2.6.8 rc1

Linux kernel 2.6.8 rc3

Linux kernel 2.6.8

Linux kernel 2.6.8 rc2

Linux kernel 2.6.9

References

Linux Kernel Local File Descriptor Passing Security Module Bypass Vulnerability

References:
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