UBUNTU-CVE-2021-40529

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Source
https://ubuntu.com/security/CVE-2021-40529
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40529.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-40529
Upstream
Published
2021-09-06T19:15:00Z
Modified
2025-09-08T16:47:21Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

The ElGamal implementation in Botan through 2.18.1, as used in Thunderbird and other products, allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.

References

Affected packages

Ubuntu:22.04:LTS

botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan@2.19.1+dfsg-2ubuntu1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.17.3+dfsg-3
2.19.1+dfsg-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "botan",
            "binary_version": "2.19.1+dfsg-2ubuntu1"
        },
        {
            "binary_name": "libbotan-2-19",
            "binary_version": "2.19.1+dfsg-2ubuntu1"
        },
        {
            "binary_name": "libbotan-2-dev",
            "binary_version": "2.19.1+dfsg-2ubuntu1"
        },
        {
            "binary_name": "python3-botan",
            "binary_version": "2.19.1+dfsg-2ubuntu1"
        }
    ]
}

Ubuntu:Pro:14.04:LTS

botan1.10

Package

Name
botan1.10
Purl
pkg:deb/ubuntu/botan1.10@1.10.5-1+deb7u1ubuntu0.14.04.1+esm1?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.10.5-1
1.10.5-1ubuntu1
1.10.5-1+deb7u1ubuntu0.14.04.1
1.10.5-1+deb7u1ubuntu0.14.04.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libbotan-1.10-0",
            "binary_version": "1.10.5-1+deb7u1ubuntu0.14.04.1+esm1"
        },
        {
            "binary_name": "libbotan1.10-dev",
            "binary_version": "1.10.5-1+deb7u1ubuntu0.14.04.1+esm1"
        }
    ]
}

Ubuntu:Pro:16.04:LTS

botan1.10

Package

Name
botan1.10
Purl
pkg:deb/ubuntu/botan1.10@1.10.12-1?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.10.10-6
1.10.12-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libbotan-1.10-1",
            "binary_version": "1.10.12-1"
        },
        {
            "binary_name": "libbotan1.10-dev",
            "binary_version": "1.10.12-1"
        }
    ]
}

Ubuntu:Pro:18.04:LTS

botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan@2.4.0-5ubuntu1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.4.0-3
2.4.0-4
2.4.0-5ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "botan",
            "binary_version": "2.4.0-5ubuntu1"
        },
        {
            "binary_name": "libbotan-2-4",
            "binary_version": "2.4.0-5ubuntu1"
        },
        {
            "binary_name": "libbotan-2-dev",
            "binary_version": "2.4.0-5ubuntu1"
        },
        {
            "binary_name": "python3-botan",
            "binary_version": "2.4.0-5ubuntu1"
        }
    ]
}

botan1.10

Package

Name
botan1.10
Purl
pkg:deb/ubuntu/botan1.10@1.10.17-0.1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.10.16-1
1.10.17-0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libbotan-1.10-1",
            "binary_version": "1.10.17-0.1"
        },
        {
            "binary_name": "libbotan1.10-dev",
            "binary_version": "1.10.17-0.1"
        }
    ]
}

Ubuntu:Pro:20.04:LTS

botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan@2.12.1-2build1?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.9.0-2
2.9.0-2build1
2.12.1-2
2.12.1-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "botan",
            "binary_version": "2.12.1-2build1"
        },
        {
            "binary_name": "libbotan-2-12",
            "binary_version": "2.12.1-2build1"
        },
        {
            "binary_name": "libbotan-2-dev",
            "binary_version": "2.12.1-2build1"
        },
        {
            "binary_name": "python3-botan",
            "binary_version": "2.12.1-2build1"
        }
    ]
}