CVE-2019-18678
It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 10.9%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 10.93% probability · 96th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- squid-cache/squid · canonical/ubuntu linux · debian/debian linux · fedoraproject/fedora
- Source
- cve@mitre.org
References
- http://www.squid-cache.org/Advisories/SQUID-2019_10.txtThird Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patchRelease Notes
- https://bugzilla.suse.com/show_bug.cgi?id=1156323Issue Tracking, Third Party Advisory
- https://github.com/squid-cache/squid/pull/445Patch, Third 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.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
- 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-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patchRelease Notes
- https://bugzilla.suse.com/show_bug.cgi?id=1156323Issue Tracking, Third Party Advisory
- https://github.com/squid-cache/squid/pull/445Patch, Third 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.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
- https://security.gentoo.org/glsa/202003-34
- https://usn.ubuntu.com/4213-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.