Cryptographic File System (CFS) dodecrypt and doencrypt denial of service
| cfs-dodecrypt-dodencrypt-dos (28288) |  Medium Risk |
Description:
Matt Blaze's Cryptographic File System (CFS) is vulnerable to a denial of service, caused by integer overflows in the dodecrypt and doencrypt functions in cfs_fh.c. By appending data to make a CFS file more than 2GB, a local attacker could cause the CFS daemon to crash.
*CVSS:
| Base Score: | 2.5 |
| Access Vector: | Local |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 1.8 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
Remedy:
For Debian Linux:
Refer to DSA 1138-1 for patch, upgrade, or suggested workaround information. See References.
References:
- Matt Blaze's Software Web page: CFS - Cryptographic File System.
- BID-19320: Cryptographic Filesystem Daemon Local Denial Of Service Vulnerability
- CVE-2006-3123: Multiple integer overflows in the (1) dodecrypt and (2) doencrypt functions in cfs_fh.c in cfsd in Matt Blaze Cryptographic File System (CFS) 1.4.1 before Debian GNU/Linux package 1.4.1-17 allow local users to cause a denial of service (daemon crash) by appending data to a file that is larger than 2 Gb.
- DSA-1138: cfs -- integer overflow
- SA21310: CFS Large File Handling Denial of Service Vulnerability
- VUPEN/ADV-2006-3157: Cryptographic Filesystem (CFS) Large File Handling Local Denial of Service Vulnerability
Platforms Affected:
- Debian Debian Linux 3.1
- Matt Blaze CFS (Cryptographic File System) 1.4.1
Reported:
Aug 04, 2006
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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.