Off-by-one error in the process_cgivars function in contrib/daemonchk.c in Nagios Core 3.5.1, 4.0.2, and earlier allows remote authenticated users to obtain sensitive information from process memory or cause a denial of service (crash) via a long string in the last key value in the variable list, which triggers a heap-based buffer over-read.

Several issues were corrected in nagios3, a monitoring and management system for hosts, services and networks.

CVE-2018-18245

Maximilian Boehner of usd AG found a cross-site scripting (XSS) vulnerability in Nagios Core. This vulnerability allows attackers to place malicious JavaScript code into the web frontend through manipulation of plugin output. In order to do this the attacker needs to be able to manipulate the output returned by nagios checks, e.g. by replacing a plugin on one of the monitored endpoints. Execution of the payload then requires that an authenticated user creates an alert summary report which contains the corresponding output.

CVE-2016-9566

It was discovered that local users with access to an account in the nagios group are able to gain root privileges via a symlink attack on the debug log file.

CVE-2014-1878

An issue was corrected that allowed remote attackers to cause a stack-based buffer overflow and subsequently a denial of service (segmentation fault) via a long message to cmd.cgi.

CVE-2013-7205 | CVE-2013-7108

A flaw was corrected in Nagios that could be exploited to cause a denial of service. This vulnerability is induced due to an off-by-one error within the process_cgivars() function, which can be exploited to cause an out-of-bounds read by sending a specially crafted key value to the Nagios web UI.

For Debian 8 'Jessie', these problems have been fixed in version 3.5.1.dfsg-2+deb8u1.

We recommend that you upgrade your nagios3 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.

Multiple off-by-one errors in Nagios Core 3.5.1, 4.0.2, and earlier, and Icinga before 1.8.5, 1.9 before 1.9.4, and 1.10 before 1.10.2 allow remote authenticated users to obtain sensitive information from process memory or cause a denial of service (crash) via a long string in the last key value in the variable list to the process_cgivars function in (1) avail.c, (2) cmd.c, (3) config.c, (4) extinfo.c, (5) histogram.c, (6) notifications.c, (7) outages.c, (8) status.c, (9) statusmap.c, (10) summary.c, and (11) trends.c in cgi/, which triggers a heap-based buffer over-read.

Stack-based buffer overflow in the cmd_submitf function in cgi/cmd.c in Nagios Core, possibly 4.0.3rc1 and earlier, and Icinga before 1.8.6, 1.9 before 1.9.5, and 1.10 before 1.10.3 allows remote attackers to cause a denial of service (segmentation fault) via a long message to cmd.cgi.

Various command-execution flaws were found in the Snoopy library included with Nagios. These flaws allowed remote attackers to execute arbitrary commands by manipulating Nagios HTTP headers.

A privilege escalation flaw was found in the way Nagios handled log files. An attacker able to control the Nagios logging configuration (the 'nagios' user/group) could use this flaw to elevate their privileges to root.

Off-by-one error in the process_cgivars function in contrib/daemonchk.c in Nagios Core 3.5.1, 4.0.2, and earlier allows remote authenticated users to obtain sensitive information from process memory or cause a denial of service (crash) via a long string in the last key value in the variable list, which triggers a heap-based buffer over-read.

rss-newsfeed.php in Nagios Core 3.4.4, 3.5.1, and earlier, when MAGPIE_CACHE_ON is set to 1, allows local users to overwrite arbitrary files via a symlink attack on /tmp/magpie_cache.

The _httpsrequest function (Snoopy/Snoopy.class.php) in Snoopy 1.2.3 and earlier, as used in (1) ampache, (2) libphp-snoopy, (3) mahara, (4) mediamate, (5) opendb, (6) pixelpost, and possibly other products, allows remote attackers to execute arbitrary commands via shell metacharacters in https URLs.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3253-1 advisory.

    It was discovered that Nagios incorrectly handled certain long strings. A remote authenticated attacker     could use this issue to cause Nagios to crash, resulting in a denial of service, or possibly obtain     sensitive information. (CVE-2013-7108, CVE-2013-7205)

    It was discovered that Nagios incorrectly handled certain long messages to cmd.cgi. A remote attacker     could possibly use this issue to cause Nagios to crash, resulting in a denial of service. (CVE-2014-1878)

    Dawid Golunski discovered that Nagios incorrectly handled symlinks when accessing log files. A local     attacker could possibly use this issue to elevate privileges. In the default installation of Ubuntu, this     should be prevented by the Yama link restrictions. (CVE-2016-9566)

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 host is affected by the vulnerability described in GLSA-201412-23 (Nagios: Multiple vulnerabilities)

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

    A remote attacker may be able to execute arbitrary code, cause a Denial       of Service condition, or obtain sensitive information.
  Workaround :

    There is no known workaround at this time.

Multiple vulnerabilities has been discovered and corrected in nagios :

Multiple off-by-one errors in Nagios Core 3.5.1, 4.0.2, and earlier, and Icinga before 1.8.5, 1.9 before 1.9.4, and 1.10 before 1.10.2 allow remote authenticated users to obtain sensitive information from process memory or cause a denial of service (crash) via a long string in the last key value in the variable list to the process_cgivars function in (1) avail.c, (2) cmd.c, (3) config.c, (4) extinfo.c, (5) histogram.c, (6) notifications.c, (7) outages.c, (8) status.c, (9) statusmap.c, (10) summary.c, and (11) trends.c in cgi/, which triggers a heap-based buffer over-read (CVE-2013-7108).

Off-by-one error in the process_cgivars function in contrib/daemonchk.c in Nagios Core 3.5.1, 4.0.2, and earlier allows remote authenticated users to obtain sensitive information from process memory or cause a denial of service (crash) via a long string in the last key value in the variable list, which triggers a heap-based buffer over-read (CVE-2013-7205).

The updated packages have been patched to correct these issues.

Eric Stanley reports :

Most CGIs previously incremented the input variable counter twice when it encountered a long key value. This could cause the CGI to read past the end of the list of CGI variables.

ID	Name	Product	Family	Severity
119875	Debian DLA-1615-1 : nagios3 security update	Nessus	Debian Local Security Checks	high
103651	Amazon Linux AMI : nagios (ALAS-2017-899)	Nessus	Amazon Linux Local Security Checks	critical
99182	Ubuntu 14.04 LTS / 16.04 LTS : Nagios vulnerabilities (USN-3253-1)	Nessus	Ubuntu Local Security Checks	high
79976	GLSA-201412-23 : Nagios: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
72019	Mandriva Linux Security Advisory : nagios (MDVSA-2014:004)	Nessus	Mandriva Local Security Checks	medium
71961	FreeBSD : nagios -- denial of service vulnerability (ba04a373-7d20-11e3-8992-00132034b086)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2013-7205

high

Tenable Plugins

high

critical

high

high

medium

medium