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.
*CVSS:
| Base Score: | 3.5 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 2.6 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
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.
References:
- Full-Disclosure Mailing List, Tue Mar 06 2007 - 11:48:08 CST: silc-server 1.0.2 denial-of-service vulnerability.
- SILC Server Web site: SILC Secure Internet Live Conferencing.
- 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
Platforms Affected:
- Gentoo Linux
- Pekka Riikonen SILC Server prior to 1.0.3
Reported:
Mar 06, 2007
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 the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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.