Buffer overflow in Squid-Cache Squid
CVE-2019-18676
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.092 (95.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.092 · newest: 0.092 · change: 0.000
Affected products
- Squid-Cache Squid
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 30, 31
Weakness classification (CWE)
References
- github.com/squid-cache/squid/pull/275 (Patch, Third Party Advisory)
- www.squid-cache.org/Advisories/SQUID-2019_8.txt (Third Party Advisory)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42… (Patch)
- usn.ubuntu.com/4213-1/ (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2020/dsa-4682 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/07/msg00009.html (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4446-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-18676?
- CVE-2019-18676 is a high-severity vulnerability in Squid-Cache Squid, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2019-11-26.
- How severe is CVE-2019-18676?
- High severity. CVSS v3 base score is 7.5 out of 10.