Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libspf2 Project | Libspf2 | < 1.2.11 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://github.com/shevek/libspf2/tree/8131fe140704eaae695e76b5cd09e39bd1dd220bThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00015.htmlMailing ListThird Party Advisory
- https://nathanielbennett.com/blog/libspf2-cve-jan-2022-disclosureExploitThird Party Advisory
- https://security.gentoo.org/glsa/202401-22
- https://github.com/shevek/libspf2/tree/8131fe140704eaae695e76b5cd09e39bd1dd220bThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00015.htmlMailing ListThird Party Advisory
- https://nathanielbennett.com/blog/libspf2-cve-jan-2022-disclosureExploitThird Party Advisory
- https://security.gentoo.org/glsa/202401-22
FAQ
What is CVE-2021-33912?
CVE-2021-33912 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...
How severe is CVE-2021-33912?
CVE-2021-33912 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-33912?
Check the references section above for vendor advisories and patch information. Affected products include: Libspf2 Project Libspf2, Debian Debian Linux.