EKG czyjest and handle_keypress functions symlink attack
| ekg-symlink (21257) |  Medium Risk |
Description:
Eksperymentalny Klient Gadu-Gadu (EKG) could allow a local attacker to launch a symlink attack caused by a vulnerability in the czyjest and handle_keypress() functions in the contrib/scripts/linki.py. EKG creates insecure temporary files. A local attacker could exploit this vulnerability by creating a symbolic link from a critical EKG file to the /tmp/rmrmg_ekg_url file. When the user runs EKG, the link will be activated as a temporary file that runs automatically. This will allow the attacker to create or overwrite arbitrary files on the system with the privileges of the targeted user running EKG.
Platforms Affected:
- Canonical, Ubuntu 5.04
- Debian, Debian Linux 3.1
- Devnull, Eksperymentalny Klient Gadu-Gadu 2005-06-05 and prior
Remedy:
For Debian Linux 3.1 (sarge):
Upgrade to the latest version of ekg (1.5+20050411-4 or later), as listed below. Refer to DSA-760-1 for more information. See References.
For Ubuntu Linux:
Refer to USN-162-1 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
File Manipulation
References:
- Debian Web site, console Gadu Gadu client for UNIX systems at http://packages.debian.org/testing/net/ekg.en.html.
- Eksperymentalny Klient Gadu-Gadu Web page, eksperymentalny klient gadu-gadu at http://dev.null.pl/ekg/. (This site is in Polish)
- Zatax Security Advisory ekg-06062005, ekg insecure temporary file creation and arbitrary code execution at http://www.zataz.net/adviso/ekg-06062005.txt.
- BID-14146: EKG Insecure Temporary File Creation Vulnerability
- BID-14307: EKG Insecure Temporary File Creation Vulnerability
- CVE-2005-1916: linki.py in ekg 2005-06-05 and earlier allows local users to overwrite or create arbitrary files via a symlink attack on temporary files.
- DSA-760: ekg -- several vulnerabilities
- USN-162-1: ekg and Gadu library vulnerabilities
Reported:
Jul 05, 2005
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