CVE-2019-12519 Information
Share on:Description
An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it’s being evaluated. When processing the expression it could either evaluate the top of the stack or add a new member to the stack. When adding a new member there is no check to ensure that the stack won’t overflow.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Reference
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html http://www.openwall.com/lists/oss-security/2020/04/23/1 https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txt https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html https://security.gentoo.org/glsa/202005-05 https://usn.ubuntu.com/4356-1/ 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
HIGH
Availability Impact
HIGH
Base Score
HIGH
Base Severity
9.8