Denial of service in F5 BIG-IP libssh2

1) Out-of-bounds write

EUVDB-ID: #VU80523

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

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

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

Vulnerable software versions

BIG-IP: 15.0.0 - 17.1.2

CPE2.3

• cpe:2.3:h:f5_networks:big-ip:15.0.1.4:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:15.1.10.5:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:16.0.1.2:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:16.1.5:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:17.0.0.2:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip:17.1.2:*:*:*:*:*:*:*

External links

http://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.