USN-4516-1

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Source
https://ubuntu.com/security/notices/USN-4516-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4516-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4516-1
Upstream
Related
Published
2020-09-17T17:41:13.676336Z
Modified
2025-09-08T16:36:49Z
Summary
gnupg2 vulnerability
Details

It was discovered that GnuPG signatures could be forged when the SHA-1 algorithm is being used. This update removes validating signatures based on SHA-1 that were generated after 2019-01-19. In environments where this is still required, a new option --allow-weak-key-signatures can be used to revert this behaviour.

References

Affected packages

Ubuntu:18.04:LTS / gnupg2

Package

Name
gnupg2
Purl
pkg:deb/ubuntu/gnupg2@2.2.4-1ubuntu1.3?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.2.4-1ubuntu1.3

Affected versions

2.*

2.1.15-1ubuntu8
2.2.4-1ubuntu1
2.2.4-1ubuntu1.1
2.2.4-1ubuntu1.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "dirmngr"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gnupg"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gnupg-agent"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gnupg-l10n"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gnupg-utils"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gnupg2"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpg"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpg-agent"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpg-wks-client"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpg-wks-server"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpgconf"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpgsm"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpgv"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpgv-static"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpgv-win32"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "gpgv2"
        },
        {
            "binary_version": "2.2.4-1ubuntu1.3",
            "binary_name": "scdaemon"
        }
    ],
    "availability": "No subscription required"
}