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Debian: CVE-2021-33912: libspf2 -- security update

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Debian: CVE-2021-33912: libspf2 -- security update

Severity
9
CVSS
(AV:N/AC:M/Au:N/C:C/I:C/A:C)
Published
01/19/2022
Created
01/25/2022
Added
01/24/2022
Modified
01/28/2022

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.

Solution(s)

  • debian-upgrade-libspf2

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