The client_host function in parsers.c in Privoxy before 3.0.24 allows remote attackers to cause a denial of service (invalid read and crash) via an empty HTTP Host header.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - privoxy: several use-after-free issues in list.c (CVE-2015-1031)

  - privoxy: invalid read via empty host header in client request (CVE-2016-1983)

  - Privoxy before 3.0.21 does not properly handle Proxy-Authenticate and Proxy-Authorization headers in the     client-server data stream, which makes it easier for remote HTTP servers to spoof the intended proxy     service via a 407 (aka Proxy Authentication Required) HTTP status code. (CVE-2013-2503)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remove_chunked_transfer_coding function allows remote attackers to cause a denial of service (invalid read and crash) via crafted chunk-encoded content. (CVE-2016-1982)

The client_host function in parsers.c allows remote attackers to cause a denial of service (invalid read and crash) via an empty HTTP Host header. (CVE-2016-1983)

Patches for CVE-2016-1982,3

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

This update to Privoxy 3.0.24 fixes two minor security issues.

The vulnerabilities should not be exploitable in the binary as compiled in openSUSE.

  - CVE-2016-1982: Corrupt chunk-encoded content could cause     an invalid read (boo#963151)

  - CVE-2016-1983: Empty Host headers in client requests     could result in invalid reads (boo#963152)

This update also contains general bug fixes and improvements as well as white and blacklist updates.

It was discovered that privoxy, a web proxy with advanced filtering capabilities, contained invalid reads that could enable a remote attacker to crash the application, thus causing a Denial of Service.

Privoxy Developers reports :

Prevent invalid reads in case of corrupt chunk-encoded content.
CVE-2016-1982. Bug discovered with afl-fuzz and AddressSanitizer.

Remove empty Host headers in client requests. Previously they would result in invalid reads. CVE-2016-1983. Bug discovered with afl-fuzz and AddressSanitizer.

CVE-2016-1982 Prevent invalid reads in case of corrupt chunk-encoded content

CVE-2016-1983 Remove empty Host headers in client requests; resulting in invalid reads.

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
199404	RHEL 5 : privoxy (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
195756	RHEL 5 : privoxy (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
89844	Amazon Linux AMI : privoxy (ALAS-2016-663)	Nessus	Amazon Linux Local Security Checks	high
89604	Fedora 22 : privoxy-3.0.23-3.fc22 (2016-bc7acd24c6)	Nessus	Fedora Local Security Checks	high
89500	Fedora 23 : privoxy-3.0.23-3.fc23 (2016-29995fbd42)	Nessus	Fedora Local Security Checks	high
88553	openSUSE Security Update : Privoxy (openSUSE-2016-132)	Nessus	SuSE Local Security Checks	high
88551	openSUSE Security Update : privoxy (openSUSE-2016-130)	Nessus	SuSE Local Security Checks	high
88495	Debian DSA-3460-1 : privoxy - security update	Nessus	Debian Local Security Checks	high
88151	FreeBSD : privoxy -- multiple vulnerabilities (a763a0e7-c3d9-11e5-b5fe-002590263bf5)	Nessus	FreeBSD Local Security Checks	high
88105	Debian DLA-398-1 : privoxy security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2016-1983

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Tenable Plugins

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