CVE-2018-20969

patch: do_ed_script in pch.c does not block strings beginning with a ! character

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Severity

Important

Red Hat Product Security

7.8

CVSS 3.0

Review impact separately from score.

Published · August 16, 2019

Updated · November 22, 2025

Description

A flaw was found in GNU patch through version 2.7.6. Strings beginning with a exclamation mark are not blocked by default. When ed receives an exclamation mark-prefixed command line argument, the argument is executed as a shell command. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 7.8
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')