SUSE Linux chkstat weak file permissions
| suse-chkstat-weak-permissions (22853) |  Low Risk |
Description:
chkstat in certain versions of SUSE Linux could allow a local attacker to modify file permissions. chkstat fails to change permissions of files that have a hardlink count of more than 1. A local attacker could create a hardlink to an arbitrary file from a world-writable directory, which could cause the link count to drop to 1, once the file is modified by the owner.
*CVSS:
| Base Score: | 2 |
| Access Vector: | Local |
| Access Complexity: | High |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 1.7 |
| Exploitability: | High |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
File Manipulation
Remedy:
For SUSE Linux:
Install the fixed kernels. Refer to SUSE Security Announcement SUSE-SA:2005:062 for more information. See References.
References:
- BugTraq Mailing List, Mon Oct 24 2005 - 04:33:18 CDT: SUSE Security Announcement: permissions (SUSE-SA:2005:062).
- BID-15182: SUSE Linux Permissions Package CHKSTAT Insecure Permissions Handling Vulnerability
- CVE-2005-3321: chkstat in SuSE Linux 9.0 through 10.0 allows local users to modify permissions of files by creating a hardlink to a file from a world-writable directory, which can cause the link count to drop to 1 when the file is deleted or replaced, which is then modified by chkstat to use weaker permissions.
- OSVDB ID: 20263: SUSE Permissions Bypass chkstat Arbitrary File Access
- SUSE-SA:2005:062: permissions: information disclosure
Platforms Affected:
- Novell UnitedLinux 1.0
- SuSE Linux Enterprise Server 8
- SUSE SuSE Linux 10.0
- SUSE SuSE Linux 9.0
- SUSE SuSE Linux 9.1
- SUSE SuSE Linux 9.2
- SUSE SuSE Linux 9.3
- SuSE SuSE Linux Desktop 1.0
- SuSE SuSE SLES 9
Reported:
Oct 24, 2005
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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.