Zero-day vulnerability in Cisco Adaptive Security Appliance (ASA)

Infinite loop
CVE-2024-20353

Vulnerability details

Advisory: SB2024042464 - Denial of service in Cisco Adaptive Security Appliance and Firepower Threat Defense Software Web Services

Vulnerable component: Cisco Adaptive Security Appliance (ASA)

CVE-ID: CVE-2024-20353

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Description:

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop when parsing HTTP headers. A remote attacker can send specially crafted HTTP request to the appliance and perform a denial of service (DoS) attack.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimet...

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.