Vulnerabilities > CVE-2019-12430 - OS Command Injection vulnerability in Gitlab 11.11.0
Attack vector
NETWORK Attack complexity
LOW Privileges required
SINGLE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
An issue was discovered in GitLab Community and Enterprise Edition 11.11. A specially crafted payload would allow an authenticated malicious user to execute commands remotely through the repository download feature. It allows Command Injection.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 2 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- 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.
- 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.
- 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.
- OS Command Injection In this type of an attack, an adversary injects operating system commands into existing application functions. An application that uses untrusted input to build command strings is vulnerable. An adversary can leverage OS command injection in an application to elevate privileges, execute arbitrary commands and compromise the underlying operating system.
Nessus
| NASL family | FreeBSD Local Security Checks |
| NASL id | FREEBSD_PKG_4091069E860B11E9A05F001B217B3468.NASL |
| description | Gitlab reports : Remote Command Execution Vulnerability on Repository Download Feature Confidential Issue Titles Revealed to Restricted Users on Unsubscribe Disclosure of Milestone Metadata through the Search API Private Project Discovery via Comment Links Metadata of Confidential Issues Disclosed to Restricted Users Mandatory External Authentication Provider Sign-In Restrictions Bypass Internal Projects Allowed to Be Created on in Private Groups Server-Side Request Forgery Through DNS Rebinding Stored Cross-Site Scripting on Wiki Pages Stored Cross-Site Scripting on Notes Repository Password Disclosed on Import Error Page Protected Branches Restriction Rules Bypass Stored Cross-Site Scripting Vulnerability on Child Epics |
| last seen | 2020-03-18 |
| modified | 2019-06-04 |
| plugin id | 125687 |
| published | 2019-06-04 |
| reporter | This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/125687 |
| title | FreeBSD : Gitlab -- Multiple Vulnerabilities (4091069e-860b-11e9-a05f-001b217b3468) |
| code | |