In Git before 2.13.7, 2.14.x before 2.14.4, 2.15.x before 2.15.2, 2.16.x before 2.16.4, and 2.17.x before 2.17.1, remote code execution can occur. With a crafted .gitmodules file, a malicious project can execute an arbitrary script on a machine that runs git clone --recurse-submodules because submodule names are obtained from this file, and then appended to $GIT_DIR/modules, leading to directory traversal with ../ in a name. Finally, post-checkout hooks from a submodule are executed, bypassing the intended design in which hooks are not obtained from a remote server.
Find out more about CVE-2018-11235 from the MITRE-CVE dictionary and NIST NVD
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