CVE-2021-40323 in Cobbler
Summary
by MITRE • 10/04/2021
Cobbler before 3.3.0 allows log poisoning, and resultant Remote Code Execution, via an XMLRPC method that logs to the logfile for template injection.
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Analysis
by VulDB Data Team • 10/08/2021
The vulnerability identified as CVE-2021-40323 represents a critical security flaw in the Cobbler configuration management system affecting versions prior to 3.3.0. This issue stems from improper input validation within the XMLRPC interface that handles template processing operations. The flaw enables attackers to inject malicious content into log files through carefully crafted template parameters, creating a log poisoning scenario that can escalate to remote code execution. The vulnerability specifically targets the logging mechanism used by Cobbler's XMLRPC methods, which are commonly employed for managing system configurations and automating deployment processes across enterprise environments.
The technical exploitation of this vulnerability occurs through the XMLRPC interface where template injection takes place during log file operations. When Cobbler processes template data through its XMLRPC methods, it fails to properly sanitize user-supplied input before logging this information to the system log files. This insufficient sanitization creates an opportunity for attackers to inject malicious payloads that can be executed when the log files are subsequently processed or parsed by other system components. The vulnerability operates at the intersection of insecure logging practices and template engine weaknesses, allowing attackers to manipulate the logging infrastructure as a vector for code execution.
The operational impact of CVE-2021-40323 extends beyond simple log manipulation to represent a full remote code execution capability within affected systems. This vulnerability directly violates security principles outlined in CWE-117, which addresses improper logging practices that can lead to information exposure and privilege escalation. Attackers can leverage this flaw to execute arbitrary code on systems running vulnerable versions of Cobbler, potentially gaining complete control over the affected infrastructure. The impact is particularly severe in enterprise environments where Cobbler is used for large-scale system management and deployment automation, as a successful exploitation could compromise entire fleets of managed systems.
Organizations should immediately implement mitigations including upgrading to Cobbler version 3.3.0 or later, which contains patches addressing the log poisoning vulnerability. Additional protective measures include implementing strict input validation for all XMLRPC endpoints, monitoring log file integrity for suspicious entries, and restricting access to Cobbler's XMLRPC interface through network segmentation and authentication controls. The vulnerability demonstrates the importance of proper input sanitization and secure logging practices as outlined in the ATT&CK framework's methodology for privilege escalation and execution techniques. Security teams should also conduct thorough audits of their Cobbler configurations and implement automated monitoring solutions to detect potential exploitation attempts in real-time.