[USN-4886-1] Privoxy vulnerabilities

========================================================================== Ubuntu Security Notice USN-4886-1 March 22, 2021
privoxy vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS – Ubuntu 16.04 LTS – Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in Privoxy.
Software Description: – privoxy: Privacy enhancing HTTP Proxy
Details:
It was discovered that Privoxy incorrectly handled CGI requests. An attacker could possibly use this issue to cause a denial of service or obtain sensitive information. (CVE-2020-35502, CVE-2021-20209, CVE-2021-20210, CVE-2021-20213, CVE-2021-20215, CVE-2021-20216, CVE-2021-20217, CVE-2021-20272, CVE-2021-20273, CVE-2021-20275)
It was discovered that Privoxy incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a denial of service or obtain sensitive information. (CVE-2021-20212, CVE-2021-20276)
It was discovered that Privoxy incorrectly handled client tags. An attacker could possibly use this issue to cause Privoxy to consume resources, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2021-20211)
It was discovered that Privoxy incorrectly handled client tags. An attacker could possibly use this issue to cause Privoxy to consume resources, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2021-20214)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10: privoxy 3.0.28-3ubuntu0.1
Ubuntu 20.04 LTS: privoxy 3.0.28-2ubuntu0.1
Ubuntu 18.04 LTS: privoxy 3.0.26-5ubuntu0.1
Ubuntu 16.04 LTS: privoxy 3.0.24-1ubuntu0.1
Ubuntu 14.04 ESM: privoxy 3.0.21-7+deb8u1ubuntu0.1~esm1
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-4886-1 CVE-2020-35502, CVE-2021-20209, CVE-2021-20210, CVE-2021-20211, CVE-2021-20212, CVE-2021-20213, CVE-2021-20214, CVE-2021-20215, CVE-2021-20216, CVE-2021-20217, CVE-2021-20272, CVE-2021-20273, CVE-2021-20275, CVE-2021-20276
Package Information: launchpad.net/ubuntu/+source/privoxy/3.0.28-3ubuntu0.1 launchpad.net/ubuntu/+source/privoxy/3.0.28-2ubuntu0.1 launchpad.net/ubuntu/+source/privoxy/3.0.26-5ubuntu0.1 launchpad.net/ubuntu/+source/privoxy/3.0.24-1ubuntu0.1