CVE-2016-1244 in unADF
Summary
by MITRE
The extractTree function in unADF allows remote attackers to execute arbitrary code via shell metacharacters in a directory name in an adf file.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 04/30/2019
The vulnerability identified as CVE-2016-1244 resides within the unADF utility, specifically in the extractTree function which processes adf files containing directory structures. This flaw represents a critical security issue that enables remote attackers to execute arbitrary code through the manipulation of directory names within adf archives. The vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly handle shell metacharacters present in directory names, creating an environment where maliciously crafted archive files can trigger unintended command execution on the target system.
The technical implementation of this vulnerability occurs when the extractTree function processes directory names without proper sanitization of special shell characters such as semicolons, ampersands, or backticks that could be interpreted by the underlying shell during archive extraction. When an attacker crafts an adf file containing directory names with these metacharacters, the function fails to properly escape or validate the input before passing it to shell commands, resulting in command injection. This type of vulnerability aligns with CWE-78, which specifically addresses improper neutralization of special elements used in OS commands, and represents a classic command injection flaw that has been consistently exploited in various security contexts.
The operational impact of this vulnerability extends beyond simple code execution to encompass potential system compromise and data exfiltration capabilities. Remote attackers can leverage this vulnerability to execute arbitrary commands with the privileges of the user running the unADF utility, potentially leading to full system compromise if the utility runs with elevated privileges. The attack vector is particularly concerning as it requires no authentication and can be triggered through simple file manipulation, making it highly exploitable in scenarios where users might unknowingly open malicious adf files. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under the T1059.001 technique for Command and Scripting Interpreter, specifically focusing on the use of shell commands for execution.
Mitigation strategies for CVE-2016-1244 should prioritize immediate patching of the unADF utility to implement proper input validation and sanitization of directory names before shell command execution. Organizations should implement strict file validation policies that prevent the processing of adf files from untrusted sources and establish automated scanning systems to detect potentially malicious archive content. The solution architecture should incorporate input sanitization libraries that properly escape shell metacharacters and implement proper privilege separation where the archive extraction process runs with minimal required permissions. Additionally, network segmentation and access controls should be enforced to limit the potential impact of successful exploitation, while regular security audits should verify that no other similar vulnerabilities exist in related file processing utilities within the system infrastructure.