CVE-2018-12020

Published: 8 June 2018

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.

From the Ubuntu Security Team

Marcus Brinkmann discovered that GnuPG before 2.2.8 improperly handled certain command line parameters. A remote attacker could use this to spoof the output of GnuPG and cause unsigned e-mail to appear signed.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
enigmail Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Needed
	cosmic	Ignored (end of life)
	disco	Ignored (end of life)
	eoan	Ignored (end of life)
	hirsute	Ignored (end of life)
	xenial	Needed
	kinetic	Ignored (end of life, was needed)
	jammy	Needed
	lunar	Not vulnerable (2:2.2.4-0.3)
	focal	Needed
	groovy	Ignored (end of life)
	impish	Ignored (end of life)
	trusty	Does not exist (trusty was needed)
	upstream	Released (2.0.7)
gnupg Launchpad, Ubuntu, Debian	impish	Does not exist
	groovy	Does not exist
	jammy	Does not exist
	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	hirsute	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	trusty	Released (1.4.16-1ubuntu2.5)
	upstream	Released (1.4.18-7+deb8u5)
	xenial	Released (1.4.20-1ubuntu3.2)
gnupg1 Launchpad, Ubuntu, Debian	impish	Not vulnerable (1.4.22-5)
	groovy	Not vulnerable (1.4.22-5)
	jammy	Not vulnerable (1.4.22-5)
	artful	Ignored (end of life)
	bionic	Needed
	cosmic	Ignored (end of life)
	disco	Ignored (end of life)
	eoan	Not vulnerable (1.4.22-5)
	focal	Not vulnerable (1.4.22-5)
	hirsute	Not vulnerable (1.4.22-5)
	kinetic	Not vulnerable (1.4.22-5)
	lunar	Not vulnerable (1.4.22-5)
	trusty	Does not exist
	upstream	Released (1.4.22-5)
	xenial	Does not exist
python-gnupg Launchpad, Ubuntu, Debian	xenial	Released (0.3.8-2ubuntu0.1~esm1) Available with Ubuntu Pro
	artful	Ignored (end of life)
	bionic	Released (0.4.1-1ubuntu1.18.04.1)
	cosmic	Released (0.4.1-1ubuntu1.18.10.1)
	disco	Not vulnerable (0.4.3-1ubuntu1)
	eoan	Not vulnerable (0.4.3-1ubuntu1)
	focal	Not vulnerable (0.4.3-1ubuntu1)
	groovy	Not vulnerable (0.4.3-1ubuntu1)
	hirsute	Not vulnerable (0.4.3-1ubuntu1)
	impish	Not vulnerable (0.4.3-1ubuntu1)
	jammy	Not vulnerable (0.4.3-1ubuntu1)
	kinetic	Not vulnerable (0.4.3-1ubuntu1)
	lunar	Not vulnerable (0.4.3-1ubuntu1)
	trusty	Released (0.3.6-1ubuntu0.1~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (0.4.3-1)
gnupg2 Launchpad, Ubuntu, Debian	artful	Released (2.1.15-1ubuntu8.1)
	bionic	Released (2.2.4-1ubuntu1.1)
	cosmic	Released (2.2.8-1ubuntu1)
	disco	Released (2.2.8-1ubuntu1)
	eoan	Released (2.2.8-1ubuntu1)
	focal	Released (2.2.8-1ubuntu1)
	groovy	Released (2.2.8-1ubuntu1)
	hirsute	Released (2.2.8-1ubuntu1)
	impish	Released (2.2.8-1ubuntu1)
	jammy	Released (2.2.8-1ubuntu1)
	kinetic	Released (2.2.8-1ubuntu1)
	lunar	Released (2.2.8-1ubuntu1)
	trusty	Released (2.0.22-3ubuntu1.4)
	upstream	Released (2.2.8-1)
	xenial	Released (2.1.11-6ubuntu2.1)

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901088

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