CVE-2018-12020

high-risk

Published 2018-06-08

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.

Do I need to act?

1.7% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (20)

Enterprise Linux Desktop

Enterprise Linux Server

Enterprise Linux Server Aus

Enterprise Linux Server Eus

Enterprise Linux Server Tus

Enterprise Linux Workstation

Ubuntu Linux

Debian Linux

Gnupg

Affected Vendors

Debian Redhat Canonical Gnupg

References (42)

Mailing List http://openwall.com/lists/oss-security/2018/06/08/2

Third Party Advisory http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html

Mailing List http://seclists.org/fulldisclosure/2019/Apr/38

Mailing List http://www.openwall.com/lists/oss-security/2019/04/30/4

Broken Link http://www.securityfocus.com/bid/104450

Broken Link http://www.securitytracker.com/id/1041051

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2180

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2181

Patch https://dev.gnupg.org/T4012

Technical Description https://github.com/RUB-NDS/Johnny-You-Are-Fired

Technical Description https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.p...

Third Party Advisory https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+Struxur...

Mailing List https://lists.debian.org/debian-lts-announce/2021/12/msg00027.html

Mailing List https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000425.html

Third Party Advisory https://usn.ubuntu.com/3675-1/

Third Party Advisory https://usn.ubuntu.com/3675-2/

Third Party Advisory https://usn.ubuntu.com/3675-3/

Third Party Advisory https://usn.ubuntu.com/3964-1/

Third Party Advisory https://www.debian.org/security/2018/dsa-4222

Third Party Advisory https://www.debian.org/security/2018/dsa-4223

and 22 more references

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high-risk

Severity 26/34 · High

Exploitability 5/34 · Minimal

Exposure 20/34 · Moderate