UBUNTU-CVE-2021-33912

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Source
https://ubuntu.com/security/CVE-2021-33912
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33912.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-33912
Upstream
Downstream
Related
Published
2022-01-19T18:15:00Z
Modified
2025-07-18T16:46:52Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to execute arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a crafted SPF DNS record, because of incorrect sprintf usage in SPFrecordexpanddata in spfexpand.c. The vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2 with Postfix; older versions of spfquery relied on libspf2) but most often is not.

References

Affected packages

Ubuntu:Pro:16.04:LTS / libspf2

Package

Name
libspf2
Purl
pkg:deb/ubuntu/libspf2@1.2.10-6ubuntu0.1~esm2?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.2.10-6ubuntu0.1~esm2

Affected versions

1.*

1.2.10-6
1.2.10-6build1
1.2.10-6ubuntu0.1~esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libmail-spf-xs-perl",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "libmail-spf-xs-perl-dbgsym",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "libspf2-2",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "libspf2-2-dbg",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "libspf2-2-dbgsym",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "libspf2-dev",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "libspf2-dev-dbgsym",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "spfquery",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        },
        {
            "binary_name": "spfquery-dbgsym",
            "binary_version": "1.2.10-6ubuntu0.1~esm2"
        }
    ]
}

Ubuntu:Pro:18.04:LTS / libspf2

Package

Name
libspf2
Purl
pkg:deb/ubuntu/libspf2@1.2.10-7ubuntu0.18.04.1~esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.2.10-7ubuntu0.18.04.1~esm1

Affected versions

1.*

1.2.10-7build2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libmail-spf-xs-perl",
            "binary_version": "1.2.10-7ubuntu0.18.04.1~esm1"
        },
        {
            "binary_name": "libspf2-2",
            "binary_version": "1.2.10-7ubuntu0.18.04.1~esm1"
        },
        {
            "binary_name": "libspf2-2-dbg",
            "binary_version": "1.2.10-7ubuntu0.18.04.1~esm1"
        },
        {
            "binary_name": "libspf2-dev",
            "binary_version": "1.2.10-7ubuntu0.18.04.1~esm1"
        },
        {
            "binary_name": "spfquery",
            "binary_version": "1.2.10-7ubuntu0.18.04.1~esm1"
        }
    ]
}

Ubuntu:20.04:LTS / libspf2

Package

Name
libspf2
Purl
pkg:deb/ubuntu/libspf2@1.2.10-7+deb9u2build0.20.04.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.2.10-7+deb9u2build0.20.04.1

Affected versions

1.*

1.2.10-7build3
1.2.10-7build4

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libmail-spf-xs-perl",
            "binary_version": "1.2.10-7+deb9u2build0.20.04.1"
        },
        {
            "binary_name": "libspf2-2",
            "binary_version": "1.2.10-7+deb9u2build0.20.04.1"
        },
        {
            "binary_name": "libspf2-2-dbg",
            "binary_version": "1.2.10-7+deb9u2build0.20.04.1"
        },
        {
            "binary_name": "libspf2-dev",
            "binary_version": "1.2.10-7+deb9u2build0.20.04.1"
        },
        {
            "binary_name": "spfquery",
            "binary_version": "1.2.10-7+deb9u2build0.20.04.1"
        }
    ]
}