CVE-2016-10243 in TeX Live
Summary
by MITRE
TeX Live allows remote attackers to execute arbitrary commands by leveraging inclusion of mpost in shell_escape_commands in the texmf.cnf config file.
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Analysis
by VulDB Data Team • 12/02/2022
The vulnerability identified as CVE-2016-10243 resides within the TeX Live document preparation system, a comprehensive collection of tools and packages used for typesetting documents. This flaw represents a critical security weakness that enables remote attackers to execute arbitrary commands on systems running TeX Live, potentially leading to complete system compromise. The vulnerability specifically targets the configuration file texmf.cnf which controls various runtime parameters for TeX Live components.
The technical root cause of this vulnerability stems from insufficient input validation and improper command execution handling within TeX Live's shell_escape_commands parameter. When the mpost program is included in the shell_escape_commands list within texmf.cnf, it creates an opportunity for attackers to inject malicious commands that will be executed with the privileges of the TeX Live process. This represents a classic command injection vulnerability where user-controllable input flows directly into system execution contexts without proper sanitization or access controls.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows attackers to execute arbitrary code on affected systems with the same privileges as the TeX Live installation. This could enable attackers to install backdoors, exfiltrate sensitive data, modify system files, or establish persistent access to the compromised environment. The remote nature of the attack means that exploitation can occur without requiring physical access to the target system, making it particularly dangerous in networked environments where TeX Live might be exposed to untrusted users or automated systems.
From a cybersecurity perspective, this vulnerability aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and can be mapped to ATT&CK technique T1059.001 for Command and Scripting Interpreter. The attack surface is particularly concerning in environments where TeX Live is used for document processing in web applications, collaborative platforms, or automated build systems. Organizations utilizing TeX Live for processing untrusted documents or user-generated content face significant risk from this vulnerability, as it can be exploited through document upload mechanisms or automated document generation processes.
Mitigation strategies should focus on immediate configuration changes to remove mpost from shell_escape_commands in texmf.cnf, followed by comprehensive system updates to the latest TeX Live versions that address this vulnerability. Additional protective measures include implementing strict access controls on TeX Live installations, restricting shell escape functionality to trusted environments only, and monitoring for suspicious command execution patterns. System administrators should also consider implementing network segmentation to limit exposure of TeX Live systems to untrusted networks and employ intrusion detection systems to monitor for exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to ensure that similar configuration issues do not exist in other components of the document processing pipeline.