[USN-4886-1] Privoxy vulnerabilities
Eduardo Barretto
eduardo.barretto at canonical.com
Mon Mar 22 17:11:40 UTC 2021
==========================================================================
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:
https://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:
https://launchpad.net/ubuntu/+source/privoxy/3.0.28-3ubuntu0.1
https://launchpad.net/ubuntu/+source/privoxy/3.0.28-2ubuntu0.1
https://launchpad.net/ubuntu/+source/privoxy/3.0.26-5ubuntu0.1
https://launchpad.net/ubuntu/+source/privoxy/3.0.24-1ubuntu0.1
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