CVE-2019-18676 Information

Description

An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://www.squid-cache.org/Advisories/SQUID-2019_8.txt http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch https://bugzilla.suse.com/show_bug.cgi?id=1156329 https://github.com/squid-cache/squid/pull/275 https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html https://lists.fedoraproject.org/archives/list/[email protected]/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/ https://lists.fedoraproject.org/archives/list/[email protected]/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/ https://usn.ubuntu.com/4213-1/ https://usn.ubuntu.com/4446-1/ https://www.debian.org/security/2020/dsa-4682

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5