CVE-2018-12020

Description

mainproc.c in GnuPG before 2.2.8 mishandles the original filename during decryption and verification actions, which allows remote attackers to spoof the output that GnuPG sends on file descriptor 2 to other programs that use the "--status-fd 2" option. For example, the OpenPGP data might represent an original filename that contains line feed characters in conjunction with GOODSIG or VALIDSIG status codes.

How to fix CVE-2018-12020

To remediate CVE-2018-12020, upgrade the affected package to a fixed version below.

—upgrade to 2.2.8-r0 or later
—upgrade to 1.4.22-r1 or later
—upgrade to 2:2.0.7-1 or later
—upgrade to 1.4.18-7+deb8u5 or later
—upgrade to 1.4.22-5 or later
—upgrade to 1.4.21-4+deb9u1 or later
—upgrade to 2.2.8-1 or later
—upgrade to 2.0.26-6+deb8u2 or later
—upgrade to 0.3.9-1+deb9u1 or later

Is CVE-2018-12020 being exploited?

Low — EPSS is 1.7%, meaning exploitation activity has not been observed at scale.

Affected packages (9)

from 0, < 2.2.8-r0
from 0, < 1.4.22-r1
from 0, < 2:2.0.7-1
from 0, < 1.4.18-7+deb8u5
from 0, < 1.4.22-5
from 0, < 1.4.21-4+deb9u1
from 0, < 2.2.8-1
from 0, < 2.0.26-6+deb8u2
from 0, < 0.3.9-1+deb9u1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N