ID CVE-2018-10900
Summary Network Manager VPNC plugin (aka networkmanager-vpnc) before version 1.2.6 is vulnerable to a privilege escalation attack. A new line character can be used to inject a Password helper parameter into the configuration data passed to VPNC, allowing an attacker to execute arbitrary commands as root.
References
Vulnerable Configurations
  • Debian Linux 8.0 (Jessie)
    cpe:2.3:o:debian:debian_linux:8.0
  • Debian Linux 9.0
    cpe:2.3:o:debian:debian_linux:9.0
CVSS
Base: 7.2
Impact:
Exploitability:
CWE CWE-77
CAPEC
  • Cause Web Server Misclassification
    An attack of this type exploits a Web server's decision to take action based on filename or file extension. Because different file types are handled by different server processes, misclassification may force the Web server to take unexpected action, or expected actions in an unexpected sequence. This may cause the server to exhaust resources, supply debug or system data to the attacker, or bind an attacker to a remote process. This type of vulnerability has been found in many widely used servers including IIS, Lotus Domino, and Orion. The attacker's job in this case is straightforward, standard communication protocols and methods are used and are generally appended with malicious information at the tail end of an otherwise legitimate request. The attack payload varies, but it could be special characters like a period or simply appending a tag that has a special meaning for operations on the server side like .jsp for a java application server. The essence of this attack is that the attacker deceives the server into executing functionality based on the name of the request, i.e. login.jsp, not the contents.
  • LDAP Injection
    An attacker manipulates or crafts an LDAP query for the purpose of undermining the security of the target. Some applications use user input to create LDAP queries that are processed by an LDAP server. For example, a user might provide their username during authentication and the username might be inserted in an LDAP query during the authentication process. An attacker could use this input to inject additional commands into an LDAP query that could disclose sensitive information. For example, entering a * in the aforementioned query might return information about all users on the system. This attack is very similar to an SQL injection attack in that it manipulates a query to gather additional information or coerce a particular return value.
  • Command Delimiters
    An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
  • File System Function Injection, Content Based
    An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
  • Exploiting Multiple Input Interpretation Layers
    An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.
  • Argument Injection
    An attacker changes the behavior or state of a targeted application through injecting data or command syntax through the targets use of non-validated and non-filtered arguments of exposed services or methods.
  • Manipulating Writeable Configuration Files
    Generally these are manually edited files that are not in the preview of the system administrators, any ability on the attackers' behalf to modify these files, for example in a CVS repository, gives unauthorized access directly to the application, the same as authorized users.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
exploit-db via4
description Network Manager VPNC 1.2.6 - 'Username' Local Privilege Escalation (Metasploit). CVE-2018-10900. Local exploit for Linux platform. Tags: Metasploit Framework...
file exploits/linux/local/45313.rb
id EDB-ID:45313
last seen 2018-10-07
modified 2018-08-31
platform linux
port
published 2018-08-31
reporter Exploit-DB
source https://www.exploit-db.com/download/45313/
title Network Manager VPNC 1.2.6 - 'Username' Local Privilege Escalation (Metasploit)
type local
metasploit via4
description This module exploits an injection vulnerability in the Network Manager VPNC plugin to gain root privileges. This module uses a new line injection vulnerability in the configured username for a VPN network connection to inject a `Password helper` configuration directive into the connection configuration. The specified helper is executed by Network Manager as root when the connection is started. Network Manager VPNC versions prior to 1.2.6 are vulnerable. This module has been tested successfully with VPNC versions: 1.2.4-4 on Debian 9.0.0 (x64); and 1.1.93-1 on Ubuntu Linux 16.04.4 (x64).
id MSF:EXPLOIT/LINUX/LOCAL/NETWORK_MANAGER_VPNC_USERNAME_PRIV_ESC
last seen 2019-03-23
modified 2019-01-10
published 2018-08-19
reliability Excellent
reporter Rapid7
source https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/network_manager_vpnc_username_priv_esc.rb
title Network Manager VPNC Username Privilege Escalation
nessus via4
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DLA-1454.NASL
    description Denis Andzakovic discovered that network-manager-vpnc, a plugin to provide VPNC support for NetworkManager, is prone to a privilege escalation vulnerability. A newline character can be used to inject a Password helper parameter into the configuration data passed to vpnc, allowing a local user with privileges to modify a system connection to execute arbitrary commands as root. For Debian 8 'Jessie', this problem has been fixed in version 0.9.10.0-1+deb8u1. We recommend that you upgrade your network-manager-vpnc 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.
    last seen 2019-02-21
    modified 2018-10-03
    plugin id 111467
    published 2018-08-02
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=111467
    title Debian DLA-1454-1 : network-manager-vpnc security update
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2018-AC02463F82.NASL
    description Update to 1.2.6 to fix a local authenticated privilege escalation bug (CVE-2018-10900). The issue has been discovered and responsibly disclosed by Denis Andzakovic: https://pulsesecurity.co.nz/advisories/NM-VPNC-Privesc 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 2019-02-21
    modified 2018-10-03
    plugin id 111361
    published 2018-07-27
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=111361
    title Fedora 27 : 1:NetworkManager-vpnc (2018-ac02463f82)
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2018-859.NASL
    description This update for NetworkManager-vpnc fixes the following issues : Security issue fixed : - CVE-2018-10900: Check configurations that contain newline characters and invalidate them to avoid security attacks (bsc#1101147). This update was imported from the SUSE:SLE-12-SP2:Update update project.
    last seen 2019-02-21
    modified 2018-10-03
    plugin id 111779
    published 2018-08-16
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=111779
    title openSUSE Security Update : NetworkManager-vpnc (openSUSE-2018-859)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2018-2297-1.NASL
    description This update for NetworkManager-vpnc fixes the following issues: Security issue fixed : - CVE-2018-10900: Check configurations that contain newline characters and invalidate them to avoid security attacks (bsc#1101147). Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-12-01
    plugin id 111662
    published 2018-08-13
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=111662
    title SUSE SLED12 Security Update : Recommended update for NetworkManager-vpnc (SUSE-SU-2018:2297-1)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-4253.NASL
    description Denis Andzakovic discovered that network-manager-vpnc, a plugin to provide VPNC support for NetworkManager, is prone to a privilege escalation vulnerability. A newline character can be used to inject a Password helper parameter into the configuration data passed to vpnc, allowing a local user with privileges to modify a system connection to execute arbitrary commands as root.
    last seen 2019-02-21
    modified 2018-11-13
    plugin id 111234
    published 2018-07-24
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=111234
    title Debian DSA-4253-1 : network-manager-vpnc - security update
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2018-EB5EA0ABAF.NASL
    description Update to 1.2.6 to fix a local authenticated privilege escalation bug (CVE-2018-10900). The issue has been discovered and responsibly disclosed by Denis Andzakovic: https://pulsesecurity.co.nz/advisories/NM-VPNC-Privesc 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 2019-02-21
    modified 2019-01-03
    plugin id 120880
    published 2019-01-03
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=120880
    title Fedora 28 : 1:NetworkManager-vpnc (2018-eb5ea0abaf)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-201808-03.NASL
    description The remote host is affected by the vulnerability described in GLSA-201808-03 (NetworkManager VPNC plugin: Privilege escalation) When initiating a VPNC connection, NetworkManager spawns a new vpnc process and passes the configuration via STDIN. By injecting a special character into a configuration parameter, an attacker can coerce NetworkManager to set the Password helper option to an attacker controlled executable file. Impact : A local attacker is able to escalate privileges via a specially crafted configuration file. Workaround : There is no known workaround at this time.
    last seen 2019-02-21
    modified 2018-10-03
    plugin id 112077
    published 2018-08-23
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=112077
    title GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation
packetstorm via4
refmap via4
confirm
debian DSA-4253
exploit-db 45313
gentoo GLSA-201808-03
misc https://pulsesecurity.co.nz/advisories/NM-VPNC-Privesc
mlist [debian-lts-announce] 20180731 [SECURITY] [DLA 1454-1] network-manager-vpnc security update
Last major update 26-07-2018 - 11:29
Published 26-07-2018 - 11:29
Last modified 21-10-2018 - 06:29
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