CVE-2011-1842 in language-selector
Summary
by MITRE
dbus_backend/lsd.py in the D-Bus backend in language-selector before 0.6.7 does not validate the arguments to the (1) SetSystemDefaultLangEnv and (2) SetSystemDefaultLanguageEnv functions, which allows local users to gain privileges via shell metacharacters in a string argument, a different vulnerability than CVE-2011-0729.
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Analysis
by VulDB Data Team • 11/05/2021
The vulnerability identified as CVE-2011-1842 resides within the D-Bus backend implementation of the language-selector package, specifically in the lsd.py script located in the dbus_backend directory. This issue affects versions of language-selector prior to 0.6.7 and represents a critical privilege escalation vulnerability that exploits improper input validation mechanisms. The flaw manifests in two distinct function interfaces: SetSystemDefaultLangEnv and SetSystemDefaultLanguageEnv, both of which fail to properly sanitize user-provided arguments before processing them within the system's execution context.
The technical root cause of this vulnerability stems from a lack of proper argument validation and sanitization within the D-Bus communication layer. When local users provide maliciously crafted string arguments containing shell metacharacters to either of these functions, the system processes these inputs without adequate filtering or escaping mechanisms. This absence of input validation creates a direct path for command injection attacks, allowing attackers to execute arbitrary commands with elevated privileges. The vulnerability operates at the intersection of D-Bus inter-process communication and shell command execution, making it particularly dangerous as it leverages legitimate system interfaces to bypass normal security controls.
From an operational perspective, this vulnerability presents a significant risk to local system integrity and security posture. An attacker with local access can exploit this flaw to escalate privileges and execute malicious commands on the target system. The impact extends beyond simple privilege escalation, as the vulnerability allows for arbitrary code execution within the context of the language-selector service, potentially enabling attackers to modify system configurations, install malware, or establish persistent access. The attack vector is particularly concerning because it requires only local user access and leverages legitimate system functions, making detection more challenging. This vulnerability aligns with CWE-78, which specifically addresses improper neutralization of special elements used in OS commands, and represents a classic example of command injection in a privileged context.
The security implications of CVE-2011-1842 extend beyond immediate privilege escalation to encompass broader system compromise potential. Attackers can utilize this vulnerability to manipulate system language settings, potentially creating backdoors or redirecting system communications. The vulnerability's exploitation aligns with techniques documented in the MITRE ATT&CK framework under privilege escalation tactics, specifically targeting the execution of malicious code through legitimate system interfaces. Organizations should consider implementing comprehensive input validation measures, including proper argument sanitization and the use of secure coding practices that prevent shell metacharacter interpretation in system-level functions. The remediation approach should focus on updating to language-selector version 0.6.7 or later, which includes proper argument validation mechanisms. Additionally, system administrators should conduct thorough security audits of D-Bus service implementations and consider implementing additional monitoring for suspicious D-Bus communication patterns that could indicate exploitation attempts.