Debian Security Advisory
DSA-066-1 cfingerd -- remote exploit
- Date Reported:
- 11 Jul 2001
- Affected Packages:
- Security database references:
- In the Bugtraq database (at SecurityFocus): BugTraq ID 2914, BugTraq ID 2915.
In Mitre's CVE dictionary: CVE-2001-0735.
- More information:
Steven van Acker reported on bugtraq that the version of cfingerd (a
configurable finger daemon) as distributed in Debian GNU/Linux 2.2
suffers from two problems:
- The code that reads configuration files (files in which $ commands are expanded) copied its input to a buffer without checking for a buffer overflow. When the ALLOW_LINE_PARSING feature is enabled that code is used for reading users' files as well, so local users could exploit this.
- There also was a printf call in the same routine that did not protect against printf format attacks.
Since ALLOW_LINE_PARSING is enabled in the default /etc/cfingerd.conf local users could use this to gain root access.
This has been fixed in version 1.4.1-1.2, and we recommend that you upgrade your cfingerd package immediately.
- Fixed in:
Debian GNU/Linux 2.2 (potato)
- Intel IA-32:
- Motorola 680x0:
- Sun Sparc:
MD5 checksums of the listed files are available in the original advisory.