Denial of service in F5OS libxml2

1) Infinite loop

EUVDB-ID: #VU24488

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-7595

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

Exploit availability: No

Description

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

The vulnerability exists due to infinite loop in xmlStringLenDecodeEntities in parser.c. A remote attacker can consume all available system resources and cause denial of service conditions in a certain end-of-file situation.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

F5OS: 1.1.0 - 1.1.4

CPE2.3

• cpe:2.3:o:f5_networks:f5os:1.1.0:*:*:*:*:*:*:*
• cpe:2.3:o:f5_networks:f5os:1.1.1:*:*:*:*:*:*:*
• cpe:2.3:o:f5_networks:f5os:1.1.2:*:*:*:*:*:*:*

External links

https://support.f5.com/csp/article/K04460334

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.