Linux kernel directory security bypass
| linux-kernel-directory-security-bypass (39672) |  Medium Risk |
Description:
The Linux kernel could allow a local attacker to bypass security restrictions, caused by a vulnerability when opening a directory and checking the access modes and open flags. If write privileges for the directory are truncated, a local attacker could call the open() function using specific flags to bypass security restrictions and truncate arbitrary directories.
Platforms Affected:
- Canonical, Ubuntu 6.06 LTS
- Canonical, Ubuntu 6.10
- Canonical, Ubuntu 7.04
- Canonical, Ubuntu 7.10
- Debian, Debian Linux 4.0
- Linux, Kernel 2.6.22
- Linux, Kernel 2.6.22.1
- Linux, Kernel 2.6.22.10
- Linux, Kernel 2.6.22.11
- Linux, Kernel 2.6.22.12
- Linux, Kernel 2.6.22.13
- Linux, Kernel 2.6.22.14
- Linux, Kernel 2.6.22.15
- Linux, Kernel 2.6.22.2
- Linux, Kernel 2.6.22.3
- Linux, Kernel 2.6.22.4
- Linux, Kernel 2.6.22.5
- Linux, Kernel 2.6.22.6
- Linux, Kernel 2.6.22.7
- Linux, Kernel 2.6.22.8
- Linux, Kernel 2.6.22.9
- Linux, Kernel 2.6.23
- Linux, Kernel 2.6.23.1
- Linux, Kernel 2.6.23.10
- Linux, Kernel 2.6.23.2
- Linux, Kernel 2.6.23.3
- Linux, Kernel 2.6.23.4
- Linux, Kernel 2.6.23.5
- Linux, Kernel 2.6.23.6
- Linux, Kernel 2.6.23.7
- Linux, Kernel 2.6.23.9
- MandrakeSoft, Mandrake Linux 2007.1
- MandrakeSoft, Mandrake Linux 2007.1 X86_64
- MandrakeSoft, Mandrake Linux 2008.0
- MandrakeSoft, Mandrake Linux 2008.0 X86_64
- RedHat, Enterprise Linux 4 WS
- RedHat, Enterprise Linux 4 Desktop
- RedHat, Enterprise Linux 4 AS
- RedHat, Enterprise Linux 4 ES
- RedHat, Enterprise Linux 5
- RedHat, Enterprise Linux 5 Client
- SuSE, SuSE Linux Enterprise Realtime 10 SP1
Remedy:
Upgrade to the latest version of the Linux kernel (2.6.22.16 or 2.6.23.14 or later), available from the The Linux Kernel Archives Web site. See References.
Consequences:
Bypass Security
References:
- The Linux Kernel Archives Web site, ChangeLog-2.6.23.14 at http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.23.14.
- ASA-2008-102: kernel security and bug fix update (RHSA-2008-0055)
- BID-27280: Linux Kernel VFS Unauthorized File Access Vulnerability
- CVE-2008-0001: VFS in the Linux kernel before 2.6.22.16, and 2.6.23.x before 2.6.23.14, performs tests of access mode by using the flag variable instead of the acc_mode variable, which might allow local users to bypass intended permissions and remove directories.
- DSA-1479: linux-2.6 -- several vulnerabilities
- MDVSA-2008:044: Updated kernel packages fix multiple vulnerabilities and bugs
- MDVSA-2008:112: Updated kernel packages fix security issues
- RHSA-2008-0055: Important: kernel security and bug fix update
- RHSA-2008-0089: Important: kernel security and bug fix update
- SA28485: Linux Kernel Directory Truncation Vulnerability
- SECTRACK ID: 1019289: Linux Kernel VFS Lets Local Users Trucate Directories
- SUSE-SA:2008:013: Linux kernel security problem
- USN-574-1: Linux kernel vulnerabilities
- USN-578-1: Linux kernel vulnerabilities
- VUPEN/ADV-2008-0151: Linux Kernel may_open() Local File Permissions Bypass Vulnerability
Reported:
Jan 14, 2008
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