Denial of service in F5OS libssh2 component

1) Out-of-bounds write

EUVDB-ID: #VU80523

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-2020-22218

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to usage of an uninitialized value within the _libssh2_transport_read() function in transport.c. A remote attacker can pass specially crafted input to the application, trigger memory corruption and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

F5OS: 1.3.0 - 1.6.2

CPE2.3

• cpe:2.3:o:f5_networks:f5os:1.3.0:*:*:*:*:*:*:*
• cpe:2.3:o:f5_networks:f5os:1.3.1:*:*:*:*:*:*:*
• cpe:2.3:o:f5_networks:f5os:1.3.2:*:*:*:*:*:*:*

External links

https://my.f5.com/manage/s/article/K000138219

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.