CVE-2018-18751 Information

Description

An issue was discovered in GNU gettext 0.19.8. There is a double free in default_add_message in read-catalog.c related to an invalid free in po_gram_parse in po-gram-gen.y as demonstrated by lt-msgfmt.

CVSS Vector

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

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00061.html http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00065.html http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00025.html https://access.redhat.com/errata/RHSA-2019:3643 https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/doublefree https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/heapcorruption https://usn.ubuntu.com/3815-1/ https://usn.ubuntu.com/3815-2/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8