PT-2021-3108 · Squid+9 · Squid+10

Joshua Rogers · Published 2021-05-10 · Updated 2024-06-15 · CVE-2021-28662

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Squid versions 4.x through 4.14 Squid versions 5.x through 5.0.5

Description An issue was discovered in Squid where a remote server can send a certain response header over HTTP or HTTPS, leading to a denial of service. This header can plausibly occur in benign network traffic. The vulnerability exists due to insufficient input validation when processing HTTP responses, allowing a remote attacker to cause a denial of service.

Recommendations For Squid versions 4.x through 4.14, update to version 4.15 or later. For Squid versions 5.x through 5.0.5, update to version 5.0.6 or later. As a temporary workaround, consider restricting access to the HTTP and HTTPS protocols to minimize the risk of exploitation.

Exploit

Fix

DoS

RCE

Improper Encoding or Escaping of Output

Weakness Enumeration

CWE-20

CWE-116

Related Identifiers

ALSA-2021:4292

ALT-PU-2021-2058

ALT-PU-2021-2829

BDU:2021-02731

CESA-2021_4292

CVE-2021-28662

DSA-4924-1

GHSA-JJQ6-MH2H-G39H

MGASA-2021-0237

OESA-2021-1240

OPENSUSE-SU-2021:0879-1

OPENSUSE-SU-2021:1961-1

OPENSUSE-SU-2021_0879-1

OPENSUSE-SU-2021_1961-1

OPENSUSE-SU-2024:11403-1

RHSA-2021:4292

RHSA-2021_4292

RLSA-2021:4292

SUSE-SU-2021:1838-1

SUSE-SU-2021:1961-1

USN-4981-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Linuxmint

Red Hat

Rocky Linux

Squid

Squid Cache

Suse

Ubuntu

References · 130

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/http/squid_range_dos.rb · Exploit
• https://github.com/squid-cache/squid/commit/051824924c709bd6162a378f746fb859454c674e · Patch
• https://github.com/squid-cache/squid/security/advisories/GHSA-jjq6-mh2h-g39h · Patch
• http://squid-cache.org/Versions/v6/changesets/squid-6-051824924c709bd6162a378f746fb859454c674e.patch · Vendor Advisory
• https://osv.dev/vulnerability/USN-4981-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33620 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-28651 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1961-1 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2021-0237 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2021-0237.html · Security Note
• https://errata.rockylinux.org/RLSA-2021:4292 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-31806 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-28662 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF · Vendor Advisory