Linksys EtherFast BEFVP41 Cable/DSL VPN Router weak key encryption

linksys-etherfast-weak-encryption (8397) The risk level is classified as LowLow Risk

Description:

Linksys EtherFast Cable/DSL VPN Router incorrectly truncates the key length for manually entered keys. If a user enters a 3DES key and MD5 authentication key, the keys are truncated to 23 bytes and 19 bytes respectively, which are both below the supposed allowed length. This vulnerability results in weaker than expected encryption.


Consequences:

Other

Remedy:

No remedy available as of August 1, 2014.

References:

  • BugTraq Mailing List, Thu Mar 07 2002 - 18:41:16 CST: Linksys BEFVP41 VPN Server does not follow proper VPN standards.
  • BID-4250: Linksys BEFVP41 Key Truncation Encryption Weakening Vulnerability
  • CVE-2002-0426: VPN Server module in Linksys EtherFast BEFVP41 Cable/DSL VPN Router before 1.40.1 reduces the key lengths for keys that are supplied via manual key entry, which makes it easier for attackers to crack the keys.
  • OSVDB ID: 6739: Linksys EtherFast VPN Router Encryption Key Implementation Weakness

Platforms Affected:

  • Linksys BEFVP41

Reported:

Mar 08, 2002

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