Buffer overflow in Squid-Cache Squid
CVE-2019-12519
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.067 (93.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.066 · newest: 0.067 · change: +0.002
Affected products
- Squid-Cache Squid
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.10
- Debian Linux — versions 9.0, 10.0
- openSUSE Leap — versions 15.1
Weakness classification (CWE)
References
- gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txt (Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/04/23/1 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2020/dsa-4682 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html (vendor-advisory, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202005-05 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4356-1/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/07/msg00009.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210205-0006/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-12519?
- CVE-2019-12519 is a critical-severity vulnerability in Squid-Cache Squid, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-04-15.
- How severe is CVE-2019-12519?
- Critical severity. CVSS v3 base score is 9.8 out of 10.