Bug 2044649 (CVE-2021-33913) - CVE-2021-33913 libspf2: heap-based buffer overflow in SPF_record_expand_data in spf_expand.c
Summary: CVE-2021-33913 libspf2: heap-based buffer overflow in SPF_record_expand_data ...
Alias: CVE-2021-33913
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 2044650 2044651
TreeView+ depends on / blocked
Reported: 2022-01-24 21:47 UTC by Pedro Sampaio
Modified: 2022-01-24 22:31 UTC (History)
1 user (show)

Fixed In Version:
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Last Closed: 2022-01-24 22:31:15 UTC

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Description Pedro Sampaio 2022-01-24 21:47:42 UTC
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 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 21:47:58 UTC
Created libspf2 tracking bugs for this issue:

Affects: epel-all [bug 2044651]
Affects: fedora-all [bug 2044650]

Comment 2 Product Security DevOps Team 2022-01-24 22:31:13 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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