Guest

Preview Tool

Cisco Bug: CSCuq86376 - X509SubjectNameMaxLength too small causes phone unable to register

Last Modified

Jul 03, 2017

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

10.5(1.10000.7) 9.1(2.10000.28)

Description (partial)

Symptoms:

A vulnerability in the Remote Mobile Access Subsystem in the Cisco Unified Communication Manager (CUCM) could allow an unauthenticated, remote
attacker to supply a crafted TLS certificate that may be accepted by the affected device.

The vulnerability is due to improper validation of the SAN field of a TLS certificate. An attacker could exploit this vulnerability by
impersonating a VCS Core device and supplying a certificate signed by a certificate authority trusted by the CUCM, but containing crafted values
within the SAN field.

Conditions:

An affected product with the default configuration running an affected version of software.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.