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Cisco Bug: CSCzv28230 - PSIRT: Warn end users when spoofing possibly invalid certificate

Last Modified

Nov 13, 2016

Products (1)

  • Cisco Web Security Appliance

Known Affected Releases

7.1.2-000 7.5.0-000 7.5.1-000 7.7.0-000

Description (partial)

Symptoms:
Cisco IronPort Web Security Appliance (WSA) software contains a vulnerability that could allow an unauthenticated, remote attacker to conduct man-
in-the-middle attacks against a targeted system.

The vulnerability is in the insecure SSL implementation of the affected operating system due to improper handling of SSL and Transport Layer Security 
(TLS) security certificates.  The affected implementation could insecurely validate the certificate authority (CA) hierarchy and could trust illegitimate 
certificates.

An unauthenticated, remote attacker could exploit the vulnerability by using a legitimate certificate to generate a security certificate for a third-party 
domain.  The attacker would then attempt to convince an affected user to visit the domain and establish an SSL connection with the domain by using 
the certificate provided. A successful attack could allow the attacker to conduct a man-in-the-middle attack against the affected user.

Conditions:
Default configuration
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
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