An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.
http://www.squid-cache.org/Advisories/SQUID-2020_3.txt
https://usn.ubuntu.com/4289-1/
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html
https://security.gentoo.org/glsa/202003-34
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
Source: MITRE
Published: 2020-02-04
Updated: 2021-07-21
Type: CWE-20
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH