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An issue was discovered in Squid through 4.7 and 5. When receiving a request, Squid checks its cache to see if it can serve up a response. It does this by making a MD5 hash of the absolute URL of the request. If found, it servers the request. The absolute URL can include the decoded UserInfo (username and password) for certain protocols. This decoded info is prepended to the domain. This allows an attacker to provide a username that has special characters to delimit the domain, and treat the rest of the URL as a path or query string. An attacker could first make a request to their domain using an encoded username, then when a request for the target domain comes in that decodes to the exact URL, it will serve the attacker's HTML instead of the real HTML. On Squid servers that also act as reverse proxies, this allows an attacker to gain access to features that only reverse proxies can use, such as ESI.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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OR
*cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
*cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Added
CPE Configuration
OR
*cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Changed
CPE Configuration
OR
*cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (including) 3.5.28
*cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (including) 4.7
*cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions from (including) 5.0 up to (including) 5.0.1
OR
*cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions up to (including) 4.7
Changed
Reference Type
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html No Types Assigned
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing List, Third Party Advisory
Changed
Reference Type
https://security.netapp.com/advisory/ntap-20210205-0006/ No Types Assigned
https://security.netapp.com/advisory/ntap-20210205-0006/ Third Party Advisory
Changed
Reference Type
https://usn.ubuntu.com/4446-1/ No Types Assigned
https://usn.ubuntu.com/4446-1/ Third Party Advisory
Changed
Reference Type
https://www.debian.org/security/2020/dsa-4682 No Types Assigned
https://www.debian.org/security/2020/dsa-4682 Third Party Advisory
OR
*cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (including) 3.5.28
*cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (including) 4.7
*cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions from (including) 5.0 up to (including) 5.0.1
Added
CVSS V2
NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Added
CVSS V3.1
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Added
CWE
NIST CWE-20
Changed
Reference Type
http://www.squid-cache.org/Versions/v4/ No Types Assigned