CSRF in Squid-Cache Squid
CVE-2019-18677
An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.072 (94.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.072 · newest: 0.072 · change: 0.000
Affected products
- Squid-Cache Squid — versions 2.7
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Fedoraproject Fedora — versions 30, 31
Weakness classification (CWE)
References
- github.com/squid-cache/squid/pull/427 (Patch, Third Party Advisory)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.squid-cache.org/Advisories/SQUID-2019_9.txt (Third Party Advisory)
- www.squid-cache.org/Versions/v4/changesets/squid-4-36492033ea4097821a4f7ff3ddcb… (Release Notes)
- www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-e5f1813a674848dde570f7… (Release Notes)
- 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)
- lists.debian.org/debian-lts-announce/2019/12/msg00011.html (mailing-list, Third Party Advisory)
- www.debian.org/security/2020/dsa-4682 (vendor-advisory)
Frequently asked questions
- What is CVE-2019-18677?
- CVE-2019-18677 is a medium-severity vulnerability in Squid-Cache Squid, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.1/10. Published 2019-11-26.
- How severe is CVE-2019-18677?
- Medium severity. CVSS v3 base score is 6.1 out of 10.