A flaw was found in Privoxy in versions before 3.0.31. An assertion failure triggered by a crafted CGI request may lead to denial of service. The highest threat from this vulnerability is to system availability.

The remote host is affected by the vulnerability described in GLSA-202107-16 (Privoxy: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in privoxy. Please review       the CVE identifiers referenced below for details.
  Impact :

    An attacker could cause a possible Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4886-1 advisory.

    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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 33 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-6fe9346693 advisory.

  - A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails     unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2021-20216)

  - A flaw was found in Privoxy in versions before 3.0.31. An assertion failure triggered by a crafted CGI     request may lead to denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2021-20217)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 32 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-f08e89a0d5 advisory.

  - A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails     unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2021-20216)

  - A flaw was found in Privoxy in versions before 3.0.31. An assertion failure triggered by a crafted CGI     request may lead to denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2021-20217)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update for privoxy fixes the following issues :

  - Update to version 3.0.31 :

  - Security/Reliability (boo#1181650)

  - Prevent an assertion from getting triggered by a crafted     CGI request. Commit 5bba5b89193fa. OVE-20210130-0001.
    CVE-2021-20217 Reported by: Joshua Rogers (Opera)

  - Fixed a memory leak when decompression fails     'unexpectedly'. Commit f431d61740cc0. OVE-20210128-0001.
    CVE-2021-20216

  - Bug fixes :

  - Fixed detection of insufficient data for decompression.
    Previously Privoxy could try to decompress a partly     uninitialized buffer.

Multiple vulnerabilites were discovered in privoxy, a privacy enhancing HTTP proxy, like memory leaks, dereference of a NULL pointer, et al.

For Debian 9 stretch, these problems have been fixed in version 3.0.26-3+deb9u1.

We recommend that you upgrade your privoxy packages.

For the detailed security status of privoxy please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/privoxy

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
157017	GLSA-202107-16 : Privoxy: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
147971	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Privoxy vulnerabilities (USN-4886-1)	Nessus	Ubuntu Local Security Checks	high
146368	Fedora 33 : privoxy (2021-6fe9346693)	Nessus	Fedora Local Security Checks	high
146358	Fedora 32 : privoxy (2021-f08e89a0d5)	Nessus	Fedora Local Security Checks	high
146317	openSUSE Security Update : privoxy (openSUSE-2021-265)	Nessus	SuSE Local Security Checks	high
146283	Debian DLA-2548-1 : privoxy security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2021-20217

high

Tenable Plugins

high

high

high

high

high

high