CVE-2012-2085 in Gajim
Summary
by MITRE
The exec_command function in common/helpers.py in Gajim before 0.15 allows user-assisted remote attackers to execute arbitrary commands via shell metacharacters in an href attribute.
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Analysis
by VulDB Data Team • 12/12/2021
The vulnerability identified as CVE-2012-2085 represents a critical command injection flaw within the Gajim instant messaging client version 0.14 and earlier. This security weakness exists in the exec_command function located within the common/helpers.py file, which processes user-provided input without adequate sanitization or validation. The vulnerability specifically manifests when the application handles hyperlinks containing shell metacharacters within the href attribute, creating an avenue for remote attackers to execute arbitrary system commands on the affected machine. The flaw demonstrates characteristics consistent with CWE-78, which describes improper neutralization of special elements used in OS commands, making it a classic command injection vulnerability. Attackers can exploit this weakness by crafting malicious hyperlinks that contain shell metacharacters such as semicolons, ampersands, or backticks, which when processed by the vulnerable exec_command function, get interpreted as shell commands rather than simple URL references.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows attackers to execute commands with the privileges of the user running the Gajim client. This presents a significant risk in environments where users may receive messages from untrusted sources, particularly in enterprise settings where instant messaging is widely used. The vulnerability is classified as user-assisted remote exploitation, meaning that the attack requires some form of user interaction to succeed, typically involving the user clicking on a malicious hyperlink contained within an instant message. This attack vector aligns with ATT&CK technique T1059.007 for command and script interpreter, specifically targeting the execution of commands through the use of shell metacharacters. The vulnerability could potentially enable attackers to access sensitive data, install malware, modify system configurations, or establish persistent access points within the compromised environment.
Mitigation strategies for this vulnerability should focus on input validation and sanitization practices that prevent shell metacharacters from being processed as command execution directives. The most effective immediate solution involves upgrading to Gajim version 0.15 or later, where the developers have implemented proper input sanitization for the exec_command function. Organizations should also consider implementing network-level protections such as web application firewalls that can detect and block malicious payloads containing shell metacharacters. Additionally, user education programs should emphasize the importance of avoiding clicking on suspicious links in instant messaging applications, particularly those received from untrusted sources. Security teams should monitor for any indicators of compromise related to this vulnerability, including unusual command execution patterns or unauthorized access attempts that may indicate exploitation attempts. The remediation process should also include reviewing and updating security policies to ensure that instant messaging clients are properly configured with appropriate security controls and that regular security updates are applied to prevent similar vulnerabilities from being exploited in the future.