CVE-2018-7032 in myrepos
Summary
by MITRE
webcheckout in myrepos through 1.20171231 does not sanitize URLs that are passed to git clone, allowing a malicious website operator or a MitM attacker to take advantage of it for arbitrary code execution, as demonstrated by an "ext::sh -c" attack or an option injection attack.
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Analysis
by VulDB Data Team • 02/06/2023
The vulnerability identified as CVE-2018-7032 affects the webcheckout component within myrepos version 1.20171231 and earlier, representing a critical security flaw that stems from inadequate input sanitization during git clone operations. This vulnerability exists within the software's handling of URLs that are passed to the git clone command, creating a path for malicious actors to exploit the system through carefully crafted inputs. The flaw allows attackers to inject arbitrary commands through the URL parameter, effectively bypassing normal security controls that would typically prevent such execution.
The technical nature of this vulnerability aligns with CWE-74, which describes improper neutralization of special elements in output used by a downstream component, and CWE-94, which covers improper control of generation of code. The attack vector specifically exploits command injection weaknesses where the webcheckout component fails to properly sanitize or validate URL inputs before passing them to the underlying git clone functionality. When a malicious URL containing shell commands is processed, the system executes these commands with the privileges of the user running the webcheckout service, potentially enabling full system compromise.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise when exploited by malicious actors. An attacker could leverage this vulnerability through a man-in-the-middle position or by compromising a malicious website operator to execute arbitrary commands on the target system. The specific attack patterns include "ext::sh -c" injection techniques that allow attackers to chain commands and execute shell operations, as well as option injection attacks that manipulate git clone parameters to achieve unauthorized access. This vulnerability effectively transforms a legitimate checkout operation into a potential attack vector for privilege escalation and persistent system access.
Mitigation strategies for CVE-2018-7032 should focus on implementing comprehensive input validation and sanitization measures within the webcheckout component. Organizations should immediately upgrade to version 1.20180101 or later where this vulnerability has been addressed through proper URL sanitization and parameter handling. The solution involves implementing strict input validation that prevents special characters and command injection sequences from being processed within URL parameters. Additionally, system administrators should consider implementing network-level protections such as firewall rules and content filtering to prevent access to potentially malicious repositories. The remediation aligns with ATT&CK technique T1059.001 for command and scripting interpreter execution, emphasizing the need for proper input sanitization to prevent arbitrary code execution. Organizations should also implement monitoring and logging of git operations to detect suspicious activities and maintain audit trails that can help identify exploitation attempts.