SB2021051925 - Arch Linux update for squid

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2021-28651)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when resolving "urn:" resource identifiers. A remote attacker can trick a user behind the proxy server to click on a specially crafted "urn:" link that leads to a server under attacker's control and force Squid to consume arbitrarily large amounts of memory on the server. 

2) Memory leak (CVE-ID: CVE-2021-28652)

The vulnerability allows a remote client to perform DoS attack on the target system.

The vulnerability exists due memory leak due to incorrect parser validation in Cache Manager API. A remote trusted client with Cache Manager API access privilege can perform denial of service attack.

3) Input validation error (CVE-ID: CVE-2021-28662)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing HTTP responses. A remote attacker who controls a malicious web page can send specially crafted HTTP response and perform a denial of service attack against the proxy server. The issue trigger is a header which can be expected to exist in HTTP traffic without any malicious intent by the server.

Remediation

Install update from vendor's website.

References

• https://security.archlinux.org/advisory/ASA-202105-10