Vulnerability Description
An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content at arbitrary URLs. Effects are isolated to software between the attacker client and Squid. There are no effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing whitespace between a header name and a colon.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Squid-Cache | Squid | >= 3.0, <= 3.5.28 |
| Canonical | Ubuntu Linux | 16.04 |
| Debian | Debian Linux | 8.0 |
| Fedoraproject | Fedora | 30 |
Related Weaknesses (CWE)
References
- http://www.squid-cache.org/Advisories/SQUID-2019_10.txtThird Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c71Release Notes
- https://bugzilla.suse.com/show_bug.cgi?id=1156323Issue TrackingThird Party Advisory
- https://github.com/squid-cache/squid/pull/445PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/12/msg00011.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202003-34
- https://usn.ubuntu.com/4213-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682
- http://www.squid-cache.org/Advisories/SQUID-2019_10.txtThird Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c71Release Notes
- https://bugzilla.suse.com/show_bug.cgi?id=1156323Issue TrackingThird Party Advisory
- https://github.com/squid-cache/squid/pull/445PatchThird Party Advisory
FAQ
What is CVE-2019-18678?
CVE-2019-18678 is a vulnerability with a CVSS score of 5.3 (MEDIUM). An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. ...
How severe is CVE-2019-18678?
CVE-2019-18678 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-18678?
Check the references section above for vendor advisories and patch information. Affected products include: Squid-Cache Squid, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora.