Debian update for openconnect

1) Buffer overflow

EUVDB-ID: #VU22305

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-16239

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary in the process_http_response when processing HTTP responses. A remote attacker that controls a malicious HTTP server can trick the victim to visit a malicious website, send an HTTP response with crafted chunk sizes for HTTP chunked encoding, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update openconnect package to one of the following versions: 7.08-1+deb9u1, 8.02-1+deb10u1.

Vulnerable software versions

Debian Linux: All versions

openconnect (Debian package): before 7.08-1+deb9u1

CPE2.3

• cpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
• cpe:2.3:a:debian:openconnect_debian_package:*:*:*:*:*:debian_linux:*:*

External links

https://www.debian.org/security/2020/dsa-4607

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.