CVE-2018-20969 Information

Description

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.

CVSS Vector

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

Reference

http://packetstormsecurity.com/files/154124/GNU-patch-Command-Injection-Directory-Traversal.html https://access.redhat.com/errata/RHSA-2019:2798 https://access.redhat.com/errata/RHSA-2019:2964 https://access.redhat.com/errata/RHSA-2019:3757 https://access.redhat.com/errata/RHSA-2019:3758 https://access.redhat.com/errata/RHSA-2019:4061 https://git.savannah.gnu.org/cgit/patch.git/commit/?id=3fcd042d26d70856e826a42b5f93dc4854d80bf0 https://github.com/irsl/gnu-patch-vulnerabilities https://seclists.org/bugtraq/2019/Aug/29

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8