Linux Kernel NFS ACL Access Control Bypass Vulnerability

BID:16570

Info

Linux Kernel NFS ACL Access Control Bypass Vulnerability

Bugtraq ID: 16570
Class: Access Validation Error
CVE: CVE-2005-3623
Remote: Yes
Local: No
Published: Feb 09 2006 12:00AM
Updated: Jan 25 2007 04:19PM
Credit: Martin Walter <[email protected]> reported this issue to the vendor.
Vulnerable: SuSE SUSE Linux Enterprise Server 8
+ Linux kernel 2.4.21
+ Linux kernel 2.4.19
SuSE Linux Openexchange Server
SuSE Linux Enterprise Server 9
SuSE Linux Desktop 1.0
S.u.S.E. UnitedLinux 1.0
S.u.S.E. SuSE Linux School Server for i386
S.u.S.E. SUSE LINUX Retail Solution 8.0
S.u.S.E. SuSE Linux Openexchange Server 4.0
S.u.S.E. SuSE Linux Open-Xchange 4.1
S.u.S.E. Open-Enterprise-Server 9.0
S.u.S.E. Novell Linux Desktop 9.0
S.u.S.E. Linux Professional 10.0 OSS
S.u.S.E. Linux Professional 10.0
S.u.S.E. Linux Professional 9.3 x86_64
S.u.S.E. Linux Professional 9.3
S.u.S.E. Linux Professional 9.2 x86_64
S.u.S.E. Linux Professional 9.2
S.u.S.E. Linux Professional 9.1 x86_64
S.u.S.E. Linux Professional 9.1
S.u.S.E. Linux Professional 9.0 x86_64
S.u.S.E. Linux Professional 9.0
S.u.S.E. Linux Professional 8.2
S.u.S.E. Linux Professional 8.2
S.u.S.E. Linux Personal 10.0 OSS
S.u.S.E. Linux Personal 9.3 x86_64
S.u.S.E. Linux Personal 9.3
S.u.S.E. Linux Personal 9.2 x86_64
S.u.S.E. Linux Personal 9.2
S.u.S.E. Linux Personal 9.1 x86_64
S.u.S.E. Linux Personal 9.1
S.u.S.E. Linux Personal 9.0 x86_64
S.u.S.E. Linux Personal 9.0
S.u.S.E. Linux Personal 8.2
S.u.S.E. Linux Office Server
S.u.S.E. Linux Enterprise Server for S/390 9.0
S.u.S.E. Linux Enterprise Server for S/390
S.u.S.E. Linux Database Server 0
S.u.S.E. Linux Connectivity Server
Redhat Enterprise Linux WS 4
Redhat Enterprise Linux ES 4
Redhat Enterprise Linux AS 4
Redhat Desktop 4.0
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 2.6.11 .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
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
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 S8500 0
Avaya S8300 R2.0.1
Avaya S8300 R2.0.0
Avaya S8300 CM 3.1
Avaya S8300 0
Avaya Messaging Storage Server MM3.0
Avaya Converged Communications Server 2.0
Not Vulnerable: Linux kernel 2.6.14 .5

Discussion

Linux Kernel NFS ACL Access Control Bypass Vulnerability

The Linux kernel's NFS implementation is prone to a remote access-control-bypass vulnerability. The software fails to validate the privileges of remote users before setting ACLs.

This issue allows remote attackers to improperly alter ACLs on NFS filesystems, allowing them to bypass access controls. Disclosure of sensitive information, modification of arbitrary files, and other attacks are possible.

Kernel versions prior to 2.6.14.5 in the 2.6 kernel series are vulnerable to this issue.

Exploit / POC

Linux Kernel NFS ACL Access Control Bypass Vulnerability

An exploit is not required.

Solution / Fix

Linux Kernel NFS ACL Access Control Bypass Vulnerability

Solution:
The vendor has released version 2.6.14.5 of the Linux kernel to address this issue.

Please see the referenced vendor advisories for details on obtaining and applying fixes.


S.u.S.E. Linux Professional 10.0

Linux kernel 2.6 -test6

Linux kernel 2.6 -test4

Linux kernel 2.6 -test2

Linux kernel 2.6 -test11

Linux kernel 2.6 -test9-CVS

Linux kernel 2.6

Linux kernel 2.6 -test3

Linux kernel 2.6 .10

Linux kernel 2.6 -test5

Linux kernel 2.6 -test1

Linux kernel 2.6 -test7

Linux kernel 2.6 -test9

Linux kernel 2.6.10 rc2

Linux kernel 2.6.11

Linux kernel 2.6.11 .6

Linux kernel 2.6.11 .12

Linux kernel 2.6.11 -rc2

Linux kernel 2.6.11 .5

Linux kernel 2.6.11 -rc3

Linux kernel 2.6.12 .4

Linux kernel 2.6.12 .3

Linux kernel 2.6.12 .1

Linux kernel 2.6.12 .5

Linux kernel 2.6.12 -rc4

Linux kernel 2.6.12 .2

Linux kernel 2.6.12 .6

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 2.6.13 -rc1

Linux kernel 2.6.13 .2

Linux kernel 2.6.14 -rc2

Linux kernel 2.6.14 .4

Linux kernel 2.6.14 -rc3

Linux kernel 2.6.14

Linux kernel 2.6.14 -rc1

Linux kernel 2.6.14 -rc4

Linux kernel 2.6.2

Linux kernel 2.6.4

Linux kernel 2.6.7 rc1

Linux kernel 2.6.7

Linux kernel 2.6.8 rc3

Linux kernel 2.6.8 rc2

Linux kernel 2.6.8 rc1

References

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