Bug 2044646 (CVE-2021-33912) - CVE-2021-33912 libspf2: Four-byte heap-based buffer overflow in SPF_record_expand_data in spf_expand.c
Summary: CVE-2021-33912 libspf2: Four-byte heap-based buffer overflow in SPF_record_ex...
Alias: CVE-2021-33912
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 2044647 2044648
TreeView+ depends on / blocked
Reported: 2022-01-24 21:46 UTC by Pedro Sampaio
Modified: 2022-01-24 22:30 UTC (History)
1 user (show)

Fixed In Version:
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Clone Of:
Last Closed: 2022-01-24 22:30:42 UTC

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Description Pedro Sampaio 2022-01-24 21:46:28 UTC
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.


Comment 1 Pedro Sampaio 2022-01-24 21:46:45 UTC
Created libspf2 tracking bugs for this issue:

Affects: epel-all [bug 2044648]
Affects: fedora-all [bug 2044647]

Comment 2 Product Security DevOps Team 2022-01-24 22:30:40 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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