libspf2: libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to execute arbitra...
CVE-2021-33912 is fixed in 4 products on 1 platform, first by libmail-spf-xs-perl 1.2.10-7ubuntu0.18.04.1~esm1, released January 19, 2022. It is not reported as exploited. Patch Radar priority: Urgent.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libmail-spf-xs-perl · Ubuntu 18.04.6 LTS (bionic) | 1.2.10-7ubuntu0.18.04.1~esm1 | libmail-spf-xs-perl 1.2.10-7ubuntu0.18.04.1~esm1 | Jan 19, 2022 |
| libmail-spf-xs-perl · Ubuntu 20.04 LTS (focal) | 1.2.10-7+deb9u2build0.20.04.1 | libmail-spf-xs-perl 1.2.10-7+deb9u2build0.20.04.1 | Jan 19, 2022 |
| libspf2 · Debian 12.15 (bookworm) | 1.2.10-7.1 | DEBIAN-CVE-2021-33912 | Jan 19, 2022 |
| libspf2 · Debian 13.5 (trixie) | 1.2.10-7.1 | DEBIAN-CVE-2021-33912 | Jan 19, 2022 |
| libspf2 · Debian 14 | 1.2.10-7.1 | DEBIAN-CVE-2021-33912 | Jan 19, 2022 |
| libspf2-2 · Ubuntu 18.04.6 LTS (bionic) | 1.2.10-7ubuntu0.18.04.1~esm1 | libspf2-2 1.2.10-7ubuntu0.18.04.1~esm1 | Jan 19, 2022 |
| libspf2-2 · Ubuntu 20.04 LTS (focal) | 1.2.10-7+deb9u2build0.20.04.1 | libspf2-2 1.2.10-7+deb9u2build0.20.04.1 | Jan 19, 2022 |
| spfquery · Ubuntu 18.04.6 LTS (bionic) | 1.2.10-7ubuntu0.18.04.1~esm1 | spfquery 1.2.10-7ubuntu0.18.04.1~esm1 | Jan 19, 2022 |
| spfquery · Ubuntu 20.04 LTS (focal) | 1.2.10-7+deb9u2build0.20.04.1 | spfquery 1.2.10-7+deb9u2build0.20.04.1 | Jan 19, 2022 |
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