PT-2021-3107 · Squid+9 · Squid+10

Joshua Rogers · Published 2021-05-10 · Updated 2024-06-15 · CVE-2021-28652

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 prior to 4.15 Squid versions 5.x prior to 5.0.6

Description The issue is related to incorrect parser validation in the Cache Manager API, allowing a Denial of Service attack. A trusted client can trigger memory leaks over time, leading to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.

Recommendations For Squid versions prior to 4.15, update to version 4.15 or later to resolve the issue. For Squid versions 5.x prior to 5.0.6, update to version 5.0.6 or later to resolve the issue. As a temporary workaround, consider restricting access to the Cache Manager API to minimize the risk of exploitation.

Exploit

Fix

DoS

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

ALSA-2021:4292

ALT-PU-2021-2058

ALT-PU-2021-2829

BDU:2021-02730

CESA-2021_4292

CVE-2021-28652

DLA-2685-1

DSA-4924-1

GHSA-M47M-9HVW-7447

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 · 137

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/http/squid_range_dos.rb · Exploit
• 🔥 https://bugs.squid-cache.org/show_bug.cgi?id=5106 · Exploit
• https://github.com/squid-cache/squid/security/advisories/GHSA-m47m-9hvw-7447 · Patch
• https://osv.dev/vulnerability/USN-4981-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33620 · Security Note
• https://linux.oracle.com/errata/ELSA-2021-9465.html · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20211008SE16 · Vendor Advisory
• 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/CVE-2021-28652 · 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://osv.dev/vulnerability/DLA-2685-1 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2021:4292 · Vendor Advisory