Trustwave's SpiderLabs Security Advisory TWSL2011-014: Vulnerability in Pantech Web Browser SSL Implementation
Published: 2011-09-23 Version: 1.0
Vendor: Pantech (http://www.pantechusa.com) Product: Link P7040P, others may be vulnerable Version affected: JLUS040201 confirmed, others may be vulnerable
Product description: The Pantech Link is a mobile phone supporting a 2.4" LCD screen and full keyboard that facilitates simple text messaging.
Credit: Paul Kehrer of Trustwave SpiderLabs
Finding: Vulnerability in Pantech Web Browser SSL Implementation
Pantech Link/P7040P browser SSL certificate parsing contains a flaw where it fails to check the Basic Constraints parameter of certificates in the chain.
By signing a new certificate using a legitimate end entity certificate, an attacker can obtain a "valid" certificate for any domain. For example:
-TrustedCA --somedomain.com (legitimate certificate) ---api.someotherdomain.com (signed by somedomain.com)
Using this technique any SSL traffic using the api.someotherdomain.com certificate can be intercepted transparently to the end user if the attacker is in control of the network.
Revision History: 08/12/11 - Vulnerability Disclosed 09/23/11 - Advisory Published
Remediation Steps: This vulnerability has not been addressed at the time of this advisory. Mobile users should be aware of this issue and proceed with caution when transmitting SSL traffic.
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