|
|
| Home > CAPEC List > Individual CAPEC Dictionary Definition (Release 1.1) | View the CAPEC List |
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Individual CAPEC Dictionary Definition (Release 1.1)
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Leveraging Race Conditions | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Attack Pattern ID | Pattern Abstraction: Standard 26 | ||||||||||||||||||||||||||||||||
| Typical Severity | High | ||||||||||||||||||||||||||||||||
| Description | Summary This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file. Attack Execution Flow
| ||||||||||||||||||||||||||||||||
| Attack Prerequisites | A resource is accessed/modified concurrently by multiple processes such that a race condition exists. The attacker has the ability to modify the resource. | ||||||||||||||||||||||||||||||||
| Typical Likelihood of Exploit | High | ||||||||||||||||||||||||||||||||
| Methods of Attack |
| ||||||||||||||||||||||||||||||||
| Examples-Instances | Description The Net Direct client for Linux before 6.0.5 in Nortel Application Switch 2424, VPN 3050 and 3070, and SSL VPN Module 1000 extracts and executes files with insecure permissions, which allows local users to exploit a race condition to replace a world-writable file in /tmp/NetClient and cause another user to execute arbitrary code when attempting to execute this client, as demonstrated by replacing /tmp/NetClient/client. Related Vulnerability CVE-2007-1057 Description The following code illustrates a file that is accessed multiple times by name in a publicly accessible directory. A race condition exists between the accesses where an attacker can replace the file referenced by the name. | ||||||||||||||||||||||||||||||||
| Attacker Skill or Knowledge Required | Medium/High | ||||||||||||||||||||||||||||||||
| Probing Techniques | Vulnerability testing tool can be used to probe for race condition. The attacker may also look for temporary file creation. The attacker may tries to replace them and take advantage of a race condition. | ||||||||||||||||||||||||||||||||
| Solutions and Mitigations | Use safe libraries to access resources such as files. Be aware that improper use of access function calls such as chown(), tempfile(), chmod(), etc. can cause a race condition. Use synchronization to control the flow of execution. Use static analysis tools to find race conditions. Pay attention to concurrency problems related to the access of resources. | ||||||||||||||||||||||||||||||||
| Attack Motivation- |
| ||||||||||||||||||||||||||||||||
| Related Weaknesses |
| ||||||||||||||||||||||||||||||||
| Purpose | Exploitation | ||||||||||||||||||||||||||||||||
| CIA Impact |
| ||||||||||||||||||||||||||||||||
| Technical Context |
| ||||||||||||||||||||||||||||||||
| References | G. Hoglund and G. McGraw. Exploiting Software: How to Break Code. Addison-Wesley, February 2004. CWE – Race Conditions Wikipedia, http://en.wikipedia.org/wik David Wheeler - Prevent race conditions - http://www-128.ibm.com/deve David Wheeler - Secure programming - http://www.dwheeler.com/sec | ||||||||||||||||||||||||||||||||
| Source |
| ||||||||||||||||||||||||||||||||