CVE-2021-33912

Publication date 19 January 2022

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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 SPF_record_expand_data in spf_expand.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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libspf2	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 1.2.10-7+deb9u2build0.20.04.1
	18.04 LTS bionic	Fixed 1.2.10-7ubuntu0.18.04.1~esm1 Ubuntu Pro
	16.04 LTS xenial	Fixed 1.2.10-6ubuntu0.1~esm2 Ubuntu Pro

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Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVE-2021-33912

Cvss 3 Severity Score

Status

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Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references