Vulnerabilities > CVE-2017-6188 - Improper Input Validation vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
NONE Integrity impact
HIGH Availability impact
NONE Summary
Munin before 2.999.6 has a local file write vulnerability when CGI graphs are enabled. Setting multiple upper_limit GET parameters allows overwriting any file accessible to the www-data user.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3215-1.NASL description It was discovered that Munin incorrectly handled CGI graphs. A remote attacker could use this issue to overwrite arbitrary files as the www-data user. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-31 modified 2017-03-03 plugin id 97523 published 2017-03-03 reporter Ubuntu Security Notice (C) 2017-2020 Canonical, Inc. / NASL script (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/97523 title Ubuntu 14.04 LTS : munin vulnerability (USN-3215-1) NASL family Fedora Local Security Checks NASL id FEDORA_2017-25DF1DBD02.NASL description - CVE-2017-6188: Upstream PR 797: Fix wrong parameter expansion in CGI Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2017-03-13 plugin id 97673 published 2017-03-13 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/97673 title Fedora 24 : munin (2017-25df1dbd02) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201710-05.NASL description The remote host is affected by the vulnerability described in GLSA-201710-05 (Munin: Arbitrary file write) When Munin is compiled with CGI graphics enabled then the files accessible to the www-data user can be overwritten. Impact : A local attacker, by setting multiple upper_limit GET parameters, could overwrite files accessible to the www-user. Workaround : There is no known workaround at this time. last seen 2020-05-31 modified 2017-10-09 plugin id 103723 published 2017-10-09 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/103723 title GLSA-201710-05 : Munin: Arbitrary file write NASL family Amazon Linux Local Security Checks NASL id ALA_ALAS-2017-818.NASL description Munin before 2.999.6 has a local file write vulnerability when CGI graphs are enabled. Setting multiple upper_limit GET parameters allows overwriting any file accessible to the www-data user. (CVE-2017-6188) last seen 2020-05-31 modified 2017-04-21 plugin id 99531 published 2017-04-21 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/99531 title Amazon Linux AMI : munin (ALAS-2017-818) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-3794.NASL description Stevie Trujillo discovered a local file write vulnerability in munin, a network-wide graphing framework, when CGI graphs are enabled. GET parameters are not properly handled, allowing to inject options into munin-cgi-graph and overwriting any file accessible by the user running the cgi-process. last seen 2020-05-31 modified 2017-02-27 plugin id 97398 published 2017-02-27 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/97398 title Debian DSA-3794-1 : munin - security update NASL family Fedora Local Security Checks NASL id FEDORA_2017-3776C9D747.NASL description - CVE-2017-6188: Upstream PR 797: Fix wrong parameter expansion in CGI Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2017-03-13 plugin id 97676 published 2017-03-13 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/97676 title Fedora 25 : munin (2017-3776c9d747) NASL family SuSE Local Security Checks NASL id OPENSUSE-2017-310.NASL description This update for munin fixes the following issues : - An attacker has been able to write arbitrary local files with the permissions of the web server, by using parameter injection (boo#1026539, CVE-2017-6188) - The MySQL plugin has been fixed to work correctly against MySQL 5.5 on Leap 42.1 last seen 2020-06-05 modified 2017-03-07 plugin id 97567 published 2017-03-07 reporter This script is Copyright (C) 2017-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/97567 title openSUSE Security Update : munin (openSUSE-2017-310)