Novell eDirectory NCP functionality denial of service

novell-edirectory-ncp-dos (33921) The risk level is classified as MediumMedium Risk

Description:

Novell eDirectory is vulnerable to a denial of service, caused by an error in the NCP functionality. By sending multiple specially-crafted fragmented requests, a remote attacker could force the daemon to stop receiving requests and consume a large amount of disk space, which would crash the eDirectory service.

*CVSS:

Base Score: 5
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to Novell Security Alert 3924657 for patch, upgrade, or suggested workaround information. See References.

References:

  • iDefense Labs PUBLIC ADVISORY: 04.26.07: Novell eDirectory NCP Fragment Denial of Service Vulnerability.
  • Novell Security Alert 3924657: Security Vulnerability: NCP Fragment Denial of Service.
  • BID-23685: Novell EDirectory NCP Fragment Length Denial Of Service Vulnerability
  • CVE-2006-4520: ncp in Novell eDirectory before 8.7.3 SP9, and 8.8.x before 8.8.1 FTF2, does not properly handle NCP fragments with a negative length, which allows remote attackers to cause a denial of service (daemon crash) when the heap is written to a log file.
  • OSVDB ID: 35667: Novell eDirectory NCP Fragment Remote DoS
  • SECTRACK ID: 1017972: Novell eDirectory NCP Fragment Processing Bug Lets Remote Users Deny Service
  • VUPEN/ADV-2007-1550: Novell eDirectory NCP Functionality Fragmented Request Denial of Service Vulnerability

Platforms Affected:

  • Novell eDirectory 8.7.3.8
  • Novell eDirectory 8.8
  • Novell eDirectory 8.8.1

Reported:

Apr 26, 2007

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