Hybserv2 private message denial of service

hybserv2-privatemessage-dos (55992) The risk level is classified as MediumMedium Risk

Description:

Hybserv2 is vulnerable to a denial of service, caused by an error when processing private messages. By sending a specially-crafted private message containing ":help \t" to the MemoServ service, a remote attacker could exploit this vulnerability to cause the service to crash.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 4.4
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • Debian Bug report logs - #550389: hybserv: misparsing when sent commands with tabs.
  • Hybrid IRC Services Web site: Hybserv2.
  • BID-38006: Hybserv2 ':help' Command Denial Of Service Vulnerability
  • CVE-2010-0303: mystring.c in hybserv in IRCD-Hybrid (aka Hybrid2 IRC Services) 1.9.2 through 1.9.4 allows remote attackers to cause a denial of service (daemon crash) via a :help \t private message to the MemoServ service.
  • DSA-1982: hybserv -- denial of service
  • OSVDB ID: 61988: Hybrid2 IRC Services MemoServ Service Private Message Remote DoS
  • SA38352: Hybrid2 IRC Services Private Message Processing Denial of Service

Platforms Affected:

  • Debian Debian Linux 5.0
  • Hybrid IRC services Hybserv2 1.9.2
  • Hybrid IRC services Hybserv2 1.9.3
  • Hybrid IRC services Hybserv2 1.9.4

Reported:

Oct 09, 2009

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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.

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