Bug 2044646 (CVE-2021-33912)

Summary: CVE-2021-33912 libspf2: Four-byte heap-based buffer overflow in SPF_record_expand_data in spf_expand.c
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: bojan
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Last Closed: 2022-01-24 22:30:42 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 2044647, 2044648    
Bug Blocks:    

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.