Title: Linux Kernel 'fasync_helper()' Local Privilege Escalation Vulnerability
Severity: HIGH
Description:
Linux kernel is prone to a local privilege-escalation vulnerability.
This issue occurs in the 'fasync_helper()' function because of a use-after-free error. The issue arises when the application handles file descriptors with the FASYNC flag set.
Local attackers can exploit this issue to execute arbitrary code with kernel-level privileges.
Successful exploits will result in the complete compromise of affected computers.
The Linux Kernel 2.6.28 and later are vulnerable.
Affected Products:
- Avaya Aura Application Enablement Services 5.2
- Avaya Aura Communication Manager 5.2
- Avaya Aura Communication Manager 5.2.1
- Avaya Aura SIP Enablement Services 5.2
- Avaya Aura SIP Enablement Services 5.2.1
- Avaya Aura Session Manager 1.1
- Avaya Aura Session Manager 5.2
- Avaya Aura System Manager 5.2
- Avaya Aura System Platform 1.1
- Avaya Communication Manager Server DEFINITY Server SI/CS
- Avaya Communication Manager Server S8100
- Avaya Communication Manager Server S8300
- Avaya Communication Manager Server S8500
- Avaya Communication Manager Server S8700
- Avaya Voice Portal 5.0
- Linux kernel 2.6.28
- Linux kernel 2.6.28 -git7
- Linux kernel 2.6.28 -rc1
- Linux kernel 2.6.28 -rc5
- Linux kernel 2.6.28 -rc7
- Linux kernel 2.6.28.1
- Linux kernel 2.6.28.10
- Linux kernel 2.6.28.2
- Linux kernel 2.6.28.3
- Linux kernel 2.6.28.4
- Linux kernel 2.6.28.5
- Linux kernel 2.6.28.6
- Linux kernel 2.6.28.8
- Linux kernel 2.6.28.9
- Linux kernel 2.6.29
- Linux kernel 2.6.29-git1
- Linux kernel 2.6.29-git14
- Linux kernel 2.6.29-git8
- Linux kernel 2.6.29-rc1
- Linux kernel 2.6.29-rc2
- Linux kernel 2.6.29-rc2-git1
- Linux kernel 2.6.29.1
- Linux kernel 2.6.29.4
- Linux kernel 2.6.30
- Linux kernel 2.6.30 -rc1
- Linux kernel 2.6.30-rc2
- Linux kernel 2.6.30-rc3
- Linux kernel 2.6.30-rc5
- Linux kernel 2.6.30-rc6
- Linux kernel 2.6.30.1
- Linux kernel 2.6.30.3
- Linux kernel 2.6.30.4
- Linux kernel 2.6.30.5
- Linux kernel 2.6.31
- Linux kernel 2.6.31-git11
- Linux kernel 2.6.31-rc1
- Linux kernel 2.6.31-rc2
- Linux kernel 2.6.31-rc3
- Linux kernel 2.6.31-rc4
- Linux kernel 2.6.31-rc5-git3
- Linux kernel 2.6.31-rc6
- Linux kernel 2.6.31-rc7
- Linux kernel 2.6.31-rc7
- Linux kernel 2.6.31-rc8
- Linux kernel 2.6.31-rc9
- Linux kernel 2.6.31.1
- Linux kernel 2.6.31.11
- Linux kernel 2.6.31.2
- Linux kernel 2.6.31.2
- Linux kernel 2.6.31.4
- Linux kernel 2.6.31.5
- Linux kernel 2.6.31.6
- Linux kernel 2.6.32
- Linux kernel 2.6.32-rc1
- Linux kernel 2.6.32-rc2
- Linux kernel 2.6.32-rc3
- Linux kernel 2.6.32-rc4
- Linux kernel 2.6.32-rc5
- Linux kernel 2.6.32-rc7
- Linux kernel 2.6.32-rc8
- Linux kernel 2.6.33-rc4
- RedHat Enterprise Linux 5 server
- RedHat Enterprise Linux Desktop 5 client
- RedHat Fedora 11
- Trustix Secure Enterprise Linux 2.0.0
- Trustix Secure Linux 2.0.0
- Trustix Secure Linux 2.1.0
- Trustix Secure Linux 2.2.0
- Ubuntu Ubuntu Linux 6.06 LTS amd64
- Ubuntu Ubuntu Linux 6.06 LTS i386
- Ubuntu Ubuntu Linux 6.06 LTS powerpc
- Ubuntu Ubuntu Linux 6.06 LTS sparc
- Ubuntu Ubuntu Linux 8.04 LTS amd64
- Ubuntu Ubuntu Linux 8.04 LTS i386
- Ubuntu Ubuntu Linux 8.04 LTS lpia
- Ubuntu Ubuntu Linux 8.04 LTS powerpc
- Ubuntu Ubuntu Linux 8.04 LTS sparc
- Ubuntu Ubuntu Linux 8.10 amd64
- Ubuntu Ubuntu Linux 8.10 i386
- Ubuntu Ubuntu Linux 8.10 lpia
- Ubuntu Ubuntu Linux 8.10 powerpc
- Ubuntu Ubuntu Linux 8.10 sparc
- Ubuntu Ubuntu Linux 9.04 amd64
- Ubuntu Ubuntu Linux 9.04 i386
- Ubuntu Ubuntu Linux 9.04 lpia
- Ubuntu Ubuntu Linux 9.04 powerpc
- Ubuntu Ubuntu Linux 9.04 sparc
- Ubuntu Ubuntu Linux 9.10 amd64
- Ubuntu Ubuntu Linux 9.10 i386
- Ubuntu Ubuntu Linux 9.10 lpia
- Ubuntu Ubuntu Linux 9.10 powerpc
- Ubuntu Ubuntu Linux 9.10 sparc
References:
- Avaya: ASA-2010-026
- Linux: fasync: split 'fasync_helper()' into separate add/remove functions
- Tavis Ormandy: Locked fasync file descriptors can be referenced after free in >= 2.6.28
- Ubuntu: Linux kernel vulnerabilities
- kernel.org: Linux kernel Homepage
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