PT-2022-2380 · Cisco · Cisco Asa

Nikita Abramov · Published 2022-04-27 · Updated 2022-05-13 · CVE-2022-20737

Positive Technologies (AI Summary)

CVSS v3.1

8.5

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco Adaptive Security Appliance (ASA) Software (affected versions not specified)

Description The issue is caused by insufficient bounds checking when parsing specific HTTP authentication messages, leading to a heap overflow in the Clientless SSL VPN component of Cisco Adaptive Security Appliance (ASA) Software. This could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of process memory from an affected device. The attacker would need to control a web server that can be accessed through the Clientless SSL VPN portal to send malicious traffic to an affected device acting as a VPN Gateway. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition, or to retrieve bytes from the device process memory that may contain sensitive information.

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

DoS

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-787

CWE-122

Related Identifiers

BDU:2022-02732

CVE-2022-20737

Affected Products

Cisco Asa

References · 7

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-vpn-heap-zLX3FdX · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-vpn-heap-zLX3FdX · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-20737 · Security Note
• https://bdu.fstec.ru/vul/2022-02732 · Security Note
• https://osv.dev/vulnerability/CVE-2022-20737 · Vendor Advisory
• https://t.me/ckure/11329 · Telegram Post
• https://t.me/ptswarm/122 · Telegram Post