PT-2019-3523 · Cisco · Cisco Asa

Published 2019-10-02 · Updated 2023-08-16 · CVE-2019-12677

Positive Technologies (AI Summary)

CVSS v3.1

7.7

High

Base vector

AV:N/AC:L/PR:L/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)

Description A vulnerability in the Secure Sockets Layer (SSL) VPN feature could allow an authenticated, remote attacker to cause a denial of service (DoS) condition that prevents the creation of new SSL/Transport Layer Security (TLS) connections to an affected device. The vulnerability is due to incorrect handling of Base64-encoded strings. An attacker could exploit this vulnerability by opening many SSL VPN sessions to an affected device, requiring valid user credentials on the affected device. A successful exploit could allow the attacker to overwrite a special system memory location, resulting in memory allocation errors for new SSL/TLS sessions to the device, preventing successful establishment of these sessions. Established SSL/TLS connections to the device and SSL/TLS connections through the device are not affected.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Improper Handling of Exceptional Conditions

Weakness Enumeration

CWE-755

CWE-172

CWE-176

Related Identifiers

BDU:2019-03700

CVE-2019-12677

Affected Products

Cisco Asa

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2019-12677 · Security Note
• https://bdu.fstec.ru/vul/2019-03700 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-asa-ssl-vpn-dos · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-12677 · Vendor Advisory