CVE-2019-6690

Published: 21 March 2019

python-gnupg 0.4.3 allows context-dependent attackers to trick gnupg to decrypt other ciphertext than intended. To perform the attack, the passphrase to gnupg must be controlled by the adversary and the ciphertext should be trusted. Related to a "CWE-20: Improper Input Validation" issue affecting the affect functionality component.

From the Ubuntu Security Team

It was discovered that python-gnupg incorrectly handled the GPG passphrase. A remote attacker could send a specially crafted passphrase that would allow them to control the output of encryption and decryption operations.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
python-gnupg Launchpad, Ubuntu, Debian	bionic	Released (0.4.1-1ubuntu1.18.04.1)
	cosmic	Released (0.4.1-1ubuntu1.18.10.1)
	disco	Released (0.4.3-1ubuntu1.19.04.1)
	eoan	Ignored (end of life)
	focal	Needed
	groovy	Ignored (end of life)
	hirsute	Ignored (end of life)
	impish	Ignored (end of life)
	jammy	Needed
	kinetic	Ignored (end of life, was needed)
	lunar	Not vulnerable (0.4.9-1)
	mantic	Not vulnerable (0.4.9-1)
	trusty	Released (0.3.6-1ubuntu0.1~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (0.4.4-1)
	xenial	Released (0.3.8-2ubuntu0.1~esm1) Available with Ubuntu Pro

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

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