CVE-2021-33913

Description

libspf2 before 1.2.11 has a 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 SPF_record_expand_data in spf_expand.c. The amount of overflowed data depends on the relationship between the length of an entire domain name and the length of its leftmost label. The vulnerable code may be part of the supply chain of a sites 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.

Risk Information

Base Score

9.8

MODERATE

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score

Exploitation Probability

1.35

Associated Vulnerability

Vulnerability	OS Platform
Sender Policy Framework for SMTP authorization (USN-6584-1) spfquery_1.2.10-7+deb9u2build0.20.04.1_amd64.deb	Linux
Sender Policy Framework for SMTP authorization (USN-6584-1) libspf2-2_1.2.10-7+deb9u2build0.20.04.1_amd64.deb	Linux
Sender Policy Framework for SMTP authorization (USN-6584-1) libspf2-dev_1.2.10-7+deb9u2build0.20.04.1_amd64.deb	Linux
Sender Policy Framework for SMTP authorization (USN-6584-1) libmail-spf-xs-perl_1.2.10-7+deb9u2build0.20.04.1_amd64.deb	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234