CVE-2020-15811
This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source.
Does this matter?
Lower severity and a low EPSS score (4.23%). Track it; it rarely justifies an emergency change on its own.
Description
An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 4.23% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-697
- Affected
- squid-cache/squid · canonical/ubuntu linux · debian/debian linux · fedoraproject/fedora · opensuse/leap
- Source
- cve@mitre.org
References
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.htmlMailing List, Third Party Advisory
- https://github.com/squid-cache/squid/security/advisories/GHSA-c7p8-xqhm-49wvPatch
- https://lists.debian.org/debian-lts-announce/2020/10/msg00005.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMTFLVB7GLRF2CKGFPZ4G4R5DIIPHWI3/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HJJDI7JQFGQLVNCKMVY64LAFMKERAOK7/Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210219-0007/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0006/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0007/Broken Link, Third Party Advisory
- https://usn.ubuntu.com/4477-1/Third Party Advisory
- https://usn.ubuntu.com/4551-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4751Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.htmlMailing List, Third Party Advisory
- https://github.com/squid-cache/squid/security/advisories/GHSA-c7p8-xqhm-49wvPatch
- https://lists.debian.org/debian-lts-announce/2020/10/msg00005.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMTFLVB7GLRF2CKGFPZ4G4R5DIIPHWI3/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HJJDI7JQFGQLVNCKMVY64LAFMKERAOK7/Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210219-0007/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0006/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0007/Broken Link, Third Party Advisory
- https://usn.ubuntu.com/4477-1/Third Party Advisory
- https://usn.ubuntu.com/4551-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4751Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.