CVE-2017-12373 Information disclosure in Cisco legacy ASA 5500 products TLS protocol implementation
Remote attackers can decrypt captured TLS sessions on legacy Cisco ASA devices via a Bleichenbacher oracle attack, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-12373?
CVE-2017-12373 is a medium-severity vulnerability in Cisco legacy ASA 5500 products TLS protocol implementation, published on 15 Dec 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the TLS protocol implementation of legacy Cisco ASA 5500 Series (ASA 5505, 5510, 5520, 5540, and 5550) devices could allow an unauthenticated, remote attacker to access sensitive information, aka a Return of Bleichenbacher's Oracle Threat (ROBOT) attack. An attacker could iteratively query a server running a vulnerable TLS stack implementation to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions. Cisco Bug IDs: CSCvg97652.
Which versions are affected by CVE-2017-12373?
It affects 5 products.
Products include Cisco Adaptive Security Appliance 5505 Firmware, Cisco Adaptive Security Appliance 5510 Firmware, Cisco Adaptive Security Appliance 5520 Firmware, Cisco Adaptive Security Appliance 5540 Firmware, Cisco Adaptive Security Appliance 5550 Firmware.
How do I fix CVE-2017-12373?
No fix has been published for CVE-2017-12373 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-12373 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-12373 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-3q2f-qcg5-6425.