FreeBSD Security Advisory FreeBSD-SA-22:03.openssl

============================================================================= FreeBSD-SA-22:03.openssl Security Advisory The FreeBSD Project
Topic: OpenSSL certificate parsing infinite loop
Category: contrib Module: openssl Announced: 2022-03-15 Credits: Tavis Ormandy from Google Affects: All supported versions of FreeBSD. Corrected: 2022-03-15 16:51:46 UTC (stable/13, 13.1-STABLE) 2022-03-15 17:42:48 UTC (releng/13.1, 13.1-BETA1-p1) 2022-03-15 17:43:02 UTC (releng/13.0, 13.0-RELEASE-p8) 2022-03-15 16:56:09 UTC (stable/12, 12.3-STABLE) 2022-03-15 18:17:50 UTC (releng/12.3, 12.3-RELEASE-p3) 2022-03-15 18:17:16 UTC (releng/12.2, 12.2-RELEASE-p14) CVE Name: CVE-2022-0778
For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit .
I. Background
FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured Open Source toolkit for the Transport Layer Security (TLS) protocol. It is also a general-purpose cryptography library.
II. Problem Description
The BN_mod_sqrt() function, which computes a modular square root, contains a bug that can cause it to loop forever for non-prime moduli. This function is used when parsing certificates that contain certain forms of elliptic curves.
III. Impact
A specially crafted certificate with invalid explicit curve parameters may trigger an infinite loop, leading to a denial of service. Since certificate parsing happens prior to verification of the certificate signature, any process that parses an externally supplied certificate may be affected.
IV. Workaround
No workaround is available.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date.
Perform one of the following:
1) To update your vulnerable system via a binary patch:
Systems running a RELEASE version of FreeBSD on the amd64, i386, or (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility:
# freebsd-update fetch # freebsd-update install
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to the applicable FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.
# fetch # fetch # gpg –verify openssl.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in .
Restart all daemons that use the library, or reboot the system.
VI. Correction details
This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches:
Branch/path Hash Revision – ————————————————————————- stable/13/ 5f3d952f6e6b stable/13-n250020 releng/13.1/ 942b5e156d41 releng/13.1-n249979 releng/13.0/ 3847c17aa23a releng/13.0-n244777 stable/12/ r371734 releng/12.3/ r371742 releng/12.2/ r371735 – ————————————————————————-
For FreeBSD 13 and later:
Run the following command to see which files were modified by a particular commit:
# git show –stat
Or visit the following URL, replacing NNNNNN with the hash:

To determine the commit count in a working tree (for comparison against nNNNNNN in the table above), run:
# git rev-list –count –first-parent HEAD
For FreeBSD 12 and earlier:
Run the following command to see which files were modified by a particular revision, replacing NNNNNN with the revision number:
# svn diff -cNNNNNN –summarize svn://
Or visit the following URL, replacing NNNNNN with the revision number:

VII. References

The latest revision of this advisory is available at —–BEGIN PGP SIGNATURE—–
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