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.
*CVSS:
| Base Score: | 4.4 |
| Access Vector: | Local |
| Access Complexity: | Medium |
| Authentication: | None |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 3.3 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
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.
References:
- The Linux Kernel Archives Web site: 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
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 2.6.22.10
- 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 2.6.22.8
- Linux Kernel 2.6.22.9
- Linux Kernel 2.6.23.10
- Linux Kernel 2.6.23.6
- Linux Kernel 2.6.23.7
- Linux Linux Kernel 2.6.22
- Linux Linux Kernel 2.6.22.1
- Linux Linux Kernel 2.6.22.3
- Linux Linux Kernel 2.6.22.4
- Linux Linux Kernel 2.6.22.5
- Linux Linux Kernel 2.6.22.6
- Linux Linux Kernel 2.6.22.7
- Linux Linux Kernel 2.6.23
- Linux Linux Kernel 2.6.23.1
- Linux Linux Kernel 2.6.23.2
- Linux Linux Kernel 2.6.23.3
- Linux Linux Kernel 2.6.23.4
- Linux Linux Kernel 2.6.23.5
- Linux 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
Reported:
Jan 14, 2008
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* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.