SILC Server apps/silcd/command.c denial of service
| silc-command-dos (32846) |  Low Risk |
Description:
SILC Server is vulnerable to a denial of service, caused by a NULL pointer dereference in the apps/silcd/command.c file. A remote attacker could exploit this vulnerability by creating or joining a server channel with a specially-crafted hmac algorithm name and no cipher algorithm name to crash the server.
Platforms Affected:
- Gentoo, Linux
- Pekka Riikonen, SILC Server prior to 1.0.3
Remedy:
Upgrade to the latest version of SILC Server (1.0.3 or later), available from the SILC Server Web site. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 200703-12 for patch, upgrade, or suggested workaround information. See References.
Consequences:
Denial of Service
References:
- Full-Disclosure Mailing List, Tue Mar 06 2007 - 11:48:08 CST, silc-server 1.0.2 denial-of-service vulnerability at http://archives.neohapsis.com/archives/fulldisclosure/2007-03/0006.html.
- SILC Server Web site, SILC Secure Internet Live Conferencing at http://silcnet.org/general/news/?item=server_20070306_1.
- BID-22846: Silc Server New Channel Remote Denial Of Service Vulnerability
- CVE-2007-1327: The SILC_SERVER_CMD_FUNC function in apps/silcd/command.c in silc-server 1.0.2 allows remote attackers to cause a denial of service (NULL dereference and daemon crash) via a request without a cipher algorithm and an invalid HMAC algorithm.
- GLSA-200703-12: SILC Server: Denial of Service
- SA24431: SILC Server Invalid hmac/cipher Denial of Service
Reported:
Mar 06, 2007
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