PT-2018-1301 · Cisco · Cisco Asa+1
Published
2018-04-18
·
Updated
2023-08-15
·
CVE-2018-0231
CVSS v3.1
8.6
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Cisco Adaptive Security Appliance (ASA) Software (affected versions not specified)
Cisco Firepower Threat Defense (FTD) Software (affected versions not specified)
Description
A vulnerability in the Transport Layer Security (TLS) library could allow an unauthenticated, remote attacker to trigger a reload of the affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a malicious TLS message to an interface enabled for Secure Layer Socket (SSL) services on an affected device. This could allow the attacker to cause a buffer underflow, triggering a crash on an affected device.
Recommendations
For Cisco Adaptive Security Appliance (ASA) Software, consider disabling the SSL services on interfaces until a patch is available.
For Cisco Firepower Threat Defense (FTD) Software, restrict access to the TLS library to minimize the risk of exploitation.
As a temporary workaround, consider blocking incoming TLS messages using SSL Version 3 (SSLv3) or SSL Version 2 (SSLv2) to reduce the attack surface.
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
DoS
RCE
Memory Corruption
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Related Identifiers
Affected Products
Cisco Asa
Cisco Ftd