CVE-2019-12519

high-risk
Published 2020-04-15

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.

Do I need to act?

~
7.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (8)

Affected Vendors

Debian Canonical Squid-Cache Opensuse

References (16)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
Mailing List http://www.openwall.com/lists/oss-security/2020/04/23/1
Third Party Advisory https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.t...
Mailing List https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
Third Party Advisory https://security.gentoo.org/glsa/202005-05
Third Party Advisory https://security.netapp.com/advisory/ntap-20210205-0006/
Third Party Advisory https://usn.ubuntu.com/4356-1/
Third Party Advisory https://www.debian.org/security/2020/dsa-4682
Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
Mailing List http://www.openwall.com/lists/oss-security/2020/04/23/1
Third Party Advisory https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.t...
Mailing List https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
Third Party Advisory https://security.gentoo.org/glsa/202005-05
Third Party Advisory https://security.netapp.com/advisory/ntap-20210205-0006/
Third Party Advisory https://usn.ubuntu.com/4356-1/
Third Party Advisory https://www.debian.org/security/2020/dsa-4682
56
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 10/34 · Low
Exposure 14/34 · Moderate