Memory leak in privoxy - CVE-2021-20212

Vulnerability identifier: #VU49174

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-20212

CWE-ID: CWE-401

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due memory leak if multiple filters are executed and the last one is skipped due to a pcre error. A remote attacker can force the application to leak memory and perform denial of service attack.

privoxy
Gentoo Linux
Fedora
Ubuntu
privoxy (Ubuntu package)
privoxy

Install updates from vendor's website.

privoxy - update to 3.0.29
privoxy (Ubuntu package) - addressed in versions 3.0.24-1ubuntu0.1, 3.0.26-5ubuntu0.1, 3.0.28-2ubuntu0.1, 3.0.28-3ubuntu0.1
privoxy - addressed in versions 3.0.31-1.el7, 3.0.32-1.el7

• https://www.privoxy.org/announce.txt

• Multiple vulnerabilities in Privoxy
• Gentoo update for Privoxy
• Ubuntu update for privoxy
• Fedora EPEL 7 update for privoxy
• Fedora EPEL 7 update for privoxy