Multiple use-after-free vulnerabilities in Privoxy before 3.0.22 allow remote attackers to have unspecified impact via vectors related to (1) the unmap function in list.c or (2) "two additional unconfirmed use-after-free complaints made by Coverity scan." NOTE: some of these details are obtained from third party information.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Multiple use-after-free vulnerabilities in Privoxy before 3.0.22 allow remote attackers to have     unspecified impact via vectors related to (1) the unmap function in list.c or (2) two additional     unconfirmed use-after-free complaints made by Coverity scan. NOTE: some of these details are obtained     from third party information. (CVE-2015-1031)

Note that Nessus relies on the presence of the package as reported by the vendor.

Privoxy Developers reports :

Fixed a memory leak when rejecting client connections due to the socket limit being reached (CID 66382). This affected Privoxy 3.0.21 when compiled with IPv6 support (on most platforms this is the default).

Fixed an immediate-use-after-free bug (CID 66394) and two additional unconfirmed use-after-free complaints made by Coverity scan (CID 66391, CID 66376).

MITRE reports :

Privoxy before 3.0.22 allows remote attackers to cause a denial of service (file descriptor consumption) via unspecified vectors.

Several vulnerabilities have been fixed in privoxy, a privacy enhancing HTTP proxy :

CVE-2015-1031, CID66394 :

unmap(): Prevent use-after-free if the map only consists of one item.

CVE-2015-1031, CID66376 and CID66391 :

pcrs_execute(): Consistently set *result to NULL in case of errors.
Should make use-after-free in the caller less likely.

CVE-2015-1381 :

Fix multiple segmentation faults and memory leaks in the pcrs code.

CVE-2015-1382 :

Fix invalid read to prevent potential crashes.

We recommend that you upgrade your privoxy packages.

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.

According to its self-identified version number, the Privoxy installed on the remote host is a version prior to 3.0.22. It is, therefore, affected by multiple vulnerabilities:

  - A denial of service vulnerability exists due to a     memory leak when client connections are rejected when     the socket limit has been reached. Note that this issue     only affects version 3.0.21 with IPv6 support, which is     enabled by default. (CVE-2015-1030)

  - Multiple unspecified use-after-free vulnerabilities     exist that could lead to arbitrary code execution.
    (CVE-2015-1031)

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

Multiple use-after-frees were discovered in Privoxy, a privacy-enhancing HTTP proxy.

ID	Name	Product	Family	Severity
218540	Linux Distros Unpatched Vulnerability : CVE-2015-1031	Nessus	Misc.	critical
88150	FreeBSD : privoxy -- multiple vulnerabilities (89d4ed09-c3d7-11e5-b5fe-002590263bf5)	Nessus	FreeBSD Local Security Checks	high
82125	Debian DLA-142-1 : privoxy security update	Nessus	Debian Local Security Checks	high
81086	Privoxy < 3.0.22 Multiple Vulnerabilities	Nessus	Firewalls	high
80871	Debian DSA-3133-1 : privoxy - security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2015-1031

critical

Tenable Plugins

critical

high

high

high

high