Linux Kernel LSM ReadV/WriteV Security Restriction Bypass Vulnerability

BID:18105

Info

Linux Kernel LSM ReadV/WriteV Security Restriction Bypass Vulnerability

Bugtraq ID: 18105
Class: Design Error
CVE: CVE-2006-1856
Remote: No
Local: Yes
Published: May 25 2006 12:00AM
Updated: Dec 18 2006 10:38PM
Credit: Kostik Belousov is credited with the discovery of this vulnerability.
Vulnerable: Ubuntu Ubuntu Linux 5.10 powerpc
Ubuntu Ubuntu Linux 5.10 i386
Ubuntu Ubuntu Linux 5.10 amd64
Ubuntu Ubuntu Linux 5.0 4 powerpc
Ubuntu Ubuntu Linux 5.0 4 i386
Ubuntu Ubuntu Linux 5.0 4 amd64
Ubuntu Ubuntu Linux 6.06 LTS powerpc
Ubuntu Ubuntu Linux 6.06 LTS i386
Ubuntu Ubuntu Linux 6.06 LTS amd64
Redhat Enterprise Linux WS 4
Redhat Enterprise Linux ES 4
Redhat Enterprise Linux AS 4
Redhat Desktop 4.0
Mandriva Linux Mandrake 2006.0 x86_64
Mandriva Linux Mandrake 2006.0
MandrakeSoft Multi Network Firewall 2.0
MandrakeSoft Corporate Server 3.0 x86_64
MandrakeSoft Corporate Server 3.0
Linux kernel 2.6.16 .9
Linux kernel 2.6.16 .8
Linux kernel 2.6.16 .7
Linux kernel 2.6.16 .5
Linux kernel 2.6.16 .4
Linux kernel 2.6.16 .3
Linux kernel 2.6.16 .2
Linux kernel 2.6.16 .11
Linux kernel 2.6.16 .1
Linux kernel 2.6.16 -rc1
Linux kernel 2.6.16
Linux kernel 2.6.15 .6
Linux kernel 2.6.15 .4
Linux kernel 2.6.15 .3
Linux kernel 2.6.15 .2
Linux kernel 2.6.15 .1
Linux kernel 2.6.15 -rc6
Linux kernel 2.6.15 -rc5
Linux kernel 2.6.15 -rc4
Linux kernel 2.6.15 -rc3
Linux kernel 2.6.15 -rc2
Linux kernel 2.6.15 -rc1
Linux kernel 2.6.15
Linux kernel 2.6.14 .5
Linux kernel 2.6.14 .4
Linux kernel 2.6.14 .3
Linux kernel 2.6.14 .2
Linux kernel 2.6.14 .1
Linux kernel 2.6.14 -rc4
Linux kernel 2.6.14 -rc3
Linux kernel 2.6.14 -rc2
Linux kernel 2.6.14 -rc1
Linux kernel 2.6.14
Linux kernel 2.6.13 .4
Linux kernel 2.6.13 .3
Linux kernel 2.6.13 .2
Linux kernel 2.6.13 .1
Linux kernel 2.6.13 -rc7
Linux kernel 2.6.13 -rc6
Linux kernel 2.6.13 -rc4
Linux kernel 2.6.13 -rc1
Linux kernel 2.6.13
Linux kernel 2.6.12 .6
Linux kernel 2.6.12 .5
Linux kernel 2.6.12 .4
Linux kernel 2.6.12 .3
Linux kernel 2.6.12 .2
Linux kernel 2.6.12 .1
Linux kernel 2.6.12 -rc5
Linux kernel 2.6.12 -rc4
Linux kernel 2.6.12 -rc1
Linux kernel 2.6.12
Linux kernel 2.6.11 .8
Linux kernel 2.6.11 .7
Linux kernel 2.6.11 .6
Linux kernel 2.6.11 .5
Linux kernel 2.6.11 .12
Linux kernel 2.6.11 .11
Linux kernel 2.6.11 -rc4
Linux kernel 2.6.11 -rc3
Linux kernel 2.6.11 -rc2
Linux kernel 2.6.11
+ Redhat Fedora Core4
Linux kernel 2.6.10 rc2
Linux kernel 2.6.10
+ Redhat Fedora Core3
+ Redhat Fedora Core2
+ Trustix Secure Linux 3.0
+ Ubuntu Ubuntu Linux 5.0 4 powerpc
+ Ubuntu Ubuntu Linux 5.0 4 i386
+ Ubuntu Ubuntu Linux 5.0 4 amd64
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
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
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 .10
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
Linux kernel 2.6.15.5
Debian Linux 3.1 sparc
Debian Linux 3.1 s/390
Debian Linux 3.1 ppc
Debian Linux 3.1 mipsel
Debian Linux 3.1 mips
Debian Linux 3.1 m68k
Debian Linux 3.1 ia-64
Debian Linux 3.1 ia-32
Debian Linux 3.1 hppa
Debian Linux 3.1 arm
Debian Linux 3.1 amd64
Debian Linux 3.1 alpha
Debian Linux 3.1
Avaya S8710 R2.0.1
Avaya S8710 R2.0.0
Avaya S8710 CM 3.1
Avaya S8700 R2.0.1
Avaya S8700 R2.0.0
Avaya S8700 CM 3.1
Avaya S8500 R2.0.1
Avaya S8500 R2.0.0
Avaya S8500 CM 3.1
Avaya S8300 R2.0.1
Avaya S8300 R2.0.0
Avaya S8300 CM 3.1
Not Vulnerable: Linux kernel 2.6.16 .12

Discussion

Linux Kernel LSM ReadV/WriteV Security Restriction Bypass Vulnerability

The Linux kernel is susceptible to a security-restriction-bypass vulnerability. This issue is due to the kernel's failure to properly enforce Linux Security Module security checks.

This issue allows local attackers to bypass security restrictions, allowing them to read and write to files they do not have permissions to access. This may aid them in further attacks.

This issue occurs during read and write calls that occur after files have been opened. During the open process, proper security checks are enforced. This means that this issue is exploitable only when access to files is revoked after they have already been opened by an attacker.

Linux kernel versions prior to 2.6.16.12 are vulnerable to this issue.

Exploit / POC

Linux Kernel LSM ReadV/WriteV Security Restriction Bypass Vulnerability

Attackers use standard operating system utilities to exploit this issue.

Solution / Fix

Linux Kernel LSM ReadV/WriteV Security Restriction Bypass Vulnerability

Solution:
The vendor has released kernel 2.6.16.12 to address this issue. Earlier versions include a fix for this issue, but missed the compatibility layer versions of 'readv' and 'writev'.

Please see the references for more information and vendor advisories.


Linux kernel 2.6 -test6

Linux kernel 2.6 -test4

Linux kernel 2.6 -test2

Linux kernel 2.6 -test9-CVS

Linux kernel 2.6 -test7

Linux kernel 2.6 -test9

Linux kernel 2.6 -test10

Linux kernel 2.6 -test11

Linux kernel 2.6.1 -rc2

Linux kernel 2.6.1

Linux kernel 2.6.10 rc2

Linux kernel 2.6.10

Linux kernel 2.6.11 -rc3

Linux kernel 2.6.11 .11

Linux kernel 2.6.11 .7

Linux kernel 2.6.11

Linux kernel 2.6.11 .6

Linux kernel 2.6.12 .4

Linux kernel 2.6.12 .1

Linux kernel 2.6.12 -rc4

Linux kernel 2.6.12 .2

Linux kernel 2.6.12 -rc1

Linux kernel 2.6.12 .3

Linux kernel 2.6.13 -rc4

Linux kernel 2.6.13 .3

Linux kernel 2.6.13

Linux kernel 2.6.13 -rc7

Linux kernel 2.6.14 .4

Linux kernel 2.6.14 .1

Linux kernel 2.6.14 .3

Linux kernel 2.6.14 -rc2

Linux kernel 2.6.14 .5

Linux kernel 2.6.14 -rc3

Linux kernel 2.6.15 -rc6

Linux kernel 2.6.15

Linux kernel 2.6.15 -rc1

Linux kernel 2.6.15 -rc3

Linux kernel 2.6.15 .4

Linux kernel 2.6.15 -rc4

Linux kernel 2.6.15 .6

Linux kernel 2.6.16 .3

Linux kernel 2.6.16 .9

Linux kernel 2.6.16 .5

Linux kernel 2.6.16 .1

Linux kernel 2.6.16 -rc1

Linux kernel 2.6.16

Linux kernel 2.6.16 .11

Linux kernel 2.6.16 .2

Linux kernel 2.6.16 .8

Linux kernel 2.6.2

Linux kernel 2.6.3

Linux kernel 2.6.4

Linux kernel 2.6.6 rc1

Linux kernel 2.6.6

Linux kernel 2.6.7

Linux kernel 2.6.8 rc2

Linux kernel 2.6.8 rc1

Linux kernel 2.6.9

References

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