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Repository.php in Gitter, as used in Gitlist, allows remote attackers with commit privileges to execute arbitrary commands via shell metacharacters in a branch name, as demonstrated by a "git checkout -b" command.
Use Gitlist vendor hub and Gitlist product page to widen CVE-2014-5023 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2018-1000533, CVE-2014-4511 and CVE-2013-7392 for nearby disclosures in the same product family.