Cryptographic File System (CFS) dodecrypt and doencrypt denial of service
| cfs-dodecrypt-dodencrypt-dos (28288) |  Low 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.
Platforms Affected:
- Debian, Debian Linux 3.1
- Matt Blaze, CFS (Cryptographic File System) 1.4.1
Remedy:
For Debian Linux:
Refer to DSA 1138-1 for patch, upgrade, or suggested workaround information. See References.
Consequences:
Denial of Service
References:
- Matt Blaze's Software Web page, CFS - Cryptographic File System at http://www.crypto.com/software/.
- 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
Reported:
Aug 04, 2006
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