Vulnerabilities > CVE-2018-12473 - Path Traversal vulnerability in Opensuse Open Build Service
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
NONE Availability impact
NONE Summary
A path traversal traversal vulnerability in obs-service-tar_scm of Open Build Service allows remote attackers to cause access files not in the current build. On the server itself this is prevented by confining the worker via KVM. Affected releases are openSUSE Open Build Service: versions prior to 70d1aa4cc4d7b940180553a63805c22fc62e2cf0.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Relative Path Traversal An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
- Directory Traversal An attacker with access to file system resources, either directly or via application logic, will use various file path specification or navigation mechanisms such as ".." in path strings and absolute paths to extend their range of access to inappropriate areas of the file system. The attacker attempts to either explore the file system for recon purposes or access directories and files that are intended to be restricted from their access. Exploring the file system can be achieved through constructing paths presented to directory listing programs, such as "ls" and 'dir', or through specially crafted programs that attempt to explore the file system. The attacker engaging in this type of activity is searching for information that can be used later in a more exploitive attack. Access to restricted directories or files can be achieved through modification of path references utilized by system applications.
- 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.
- Using Slashes and URL Encoding Combined to Bypass Validation Logic This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple way of encoding an URL and abuse the interpretation of the URL. An URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
- 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.
Nessus
| NASL family | SuSE Local Security Checks |
| NASL id | OPENSUSE-2019-326.NASL |
| description | This update for obs-service-tar_scm fixes the following issues : Security vulnerabilities addressed : - CVE-2018-12473: Fixed a path traversal issue, which allowed users to access files outside of the repository using relative paths (bsc#1105361) - CVE-2018-12474: Fixed an issue whereby crafted service parameters allowed for unexpected behaviour (bsc#1107507) - CVE-2018-12476: Fixed an issue whereby the outfilename parameter allowed to write files outside of package directory (bsc#1107944) Other bug fixes and changes made : - Prefer UTF-8 locale as output format for changes - added KankuFile - fix problems with unicode source files - added python-six to Requires in specfile - better encoding handling - fixes bsc#1082696 and bsc#1076410 - fix unicode in containers - move to python3 - added logging for better debugging changesgenerate - raise exception if no changesauthor given - Stop using @opensuse.org addresses to indicate a missing address - move argparse dep to -common package - allow submodule and ssl options in appimage - sync spec file as used in openSUSE:Tools project - check encoding problems for svn and print proper error msg - added new param |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 122848 |
| published | 2019-03-14 |
| 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/122848 |
| title | openSUSE Security Update : obs-service-tar_scm (openSUSE-2019-326) |
| code | |