Network Block Device negotiation denial of service

networkblock-negotiation-dos (67502) The risk level is classified as MediumMedium Risk

Description:

Network Block Device is vulnerable to a denial of service, caused by a NULL pointer dereference in the negotiation phase. A remote attacker could exploit this vulnerability to cause negotiation to fail.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of Network Block Device (1:2.9.22-1 or later), available from the Network Block Device Web site. See References.

References:

  • Debian Bug report logs - #627042: security flaw in 2.9.21.
  • Network Block Device Web site: Network Block Device.
  • BID-47884: Network Block Device Server NULL Pointer Dereference Denial of Service Vulnerability
  • CVE-2011-1925: nbd-server.c in Network Block Device (nbd-server) 2.9.21 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by causing a negotiation failure, as demonstrated by specifying a name for a non-existent export.
  • OSVDB ID: 73401: Network Block Device ndb-server.c serveloop() Function NULL Dereference Remote DoS
  • OSVDB ID: 73402: Network Block Device nbd-server.c negotiate() Function Negotiation Packet Handling Remote DoS
  • SA44596: Network Block Device Two Denial of Service Vulnerabilities

Platforms Affected:

  • Network Block Device Network Block Device 2.9.21-1

Reported:

May 17, 2011

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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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