CVE-2021-33912
Published: 19 January 2022
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.
Priority
Status
Package | Release | Status |
---|---|---|
libspf2 Launchpad, Ubuntu, Debian |
bionic |
Released
(1.2.10-7ubuntu0.18.04.1~esm1)
Available with Ubuntu Pro |
focal |
Released
(1.2.10-7+deb9u2build0.20.04.1)
|
|
hirsute |
Ignored
(end of life)
|
|
impish |
Ignored
(end of life)
|
|
jammy |
Not vulnerable
(1.2.10-7.1ubuntu1)
|
|
kinetic |
Ignored
(end of life, was needs-triage)
|
|
lunar |
Not vulnerable
(1.2.10-7.2build1)
|
|
mantic |
Not vulnerable
(1.2.10-7.2build1)
|
|
noble |
Not vulnerable
(noble 1.2.10-8)
|
|
upstream |
Needs triage
|
|
xenial |
Released
(1.2.10-6ubuntu0.1~esm2)
Available with Ubuntu Pro |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 9.8 |
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 |