NULL pointer dereference in privoxy - CVE-2021-20213
Published: December 29, 2020 / Updated: February 3, 2021
Vulnerability identifier: #VU49177
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-2021-20213
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error, if accept-intercepted-requests is enabled. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Affected software
privoxy
Gentoo Linux
Fedora
Ubuntu
privoxy (Ubuntu package)
privoxy
Gentoo Linux
Fedora
Ubuntu
privoxy (Ubuntu package)
privoxy
How to mitigate CVE-2021-20213
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
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