Input validation error in privoxy - CVE-2021-20273
Published: February 28, 2021 / Updated: March 6, 2021
Vulnerability identifier: #VU50974
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-2021-20273
CWE-ID: CWE-20
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 insufficient validation of user-supplied input within the cgi_send_banner() function. A remote attacker can pass specially crafted CGI request with an invalid image type and perform a denial of service (DoS) attack.
Affected software
privoxy
Gentoo Linux
Ubuntu
privoxy (Ubuntu package)
Gentoo Linux
Ubuntu
privoxy (Ubuntu package)
How to mitigate CVE-2021-20273
Install updates from vendor's website.
privoxy - update to 3.0.32
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 (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