Unrestricted Command Execution in GNU Patch through 2.7.6

CVE-2018-20969 · HIGH Severity

AV:N/AC:M/AU:N/C:C/I:C/A:C

do_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: this is the same commit as for CVE-2019-13638, but the ! syntax is specific to ed, and is unrelated to a shell metacharacter.

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