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

    From FreeBSD Security Advisories@21:1/5 to All on Tue Mar 15 20:00:09 2022
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    ============================================================================= 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 <URL:https://security.FreeBSD.org/>.

    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 https://security.FreeBSD.org/patches/SA-22:03/openssl.patch
    # fetch https://security.FreeBSD.org/patches/SA-22:03/openssl.patch.asc
    # 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 <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

    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 <commit hash>

    Or visit the following URL, replacing NNNNNN with the hash:

    <URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>

    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://svn.freebsd.org/base

    Or visit the following URL, replacing NNNNNN with the revision number:

    <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

    VII. References

    <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0778>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-22:03.openssl.asc> -----BEGIN PGP SIGNATURE-----

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