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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-19:09.iconv

    From FreeBSD Security Advisories@21:1/5 to All on Tue Aug 13 05:48:33 2019
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    ============================================================================= FreeBSD-SA-19:09.iconv Security Advisory
    The FreeBSD Project

    Topic: iconv buffer overflow

    Category: core
    Module: libc
    Announced: 2019-07-02
    Credits: Andrea Venturoli <security@netfence.it>, NetFence
    Affects: All supported versions of FreeBSD.
    Corrected: 2019-07-03 00:01:38 UTC (stable/12, 12.0-STABLE)
    2019-07-03 00:00:39 UTC (releng/12.0, 12.0-RELEASE-p7)
    2019-07-03 00:03:14 UTC (stable/11, 11.3-PRERELEASE)
    2019-07-03 00:00:39 UTC (releng/11.3, 11.3-RC3-p1)
    2019-07-03 00:00:39 UTC (releng/11.2, 11.2-RELEASE-p11)
    CVE Name: CVE-2019-5600

    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

    The iconv(3) API converts text data from one character encoding to another
    and is available as part of the standard C library (libc).

    II. Problem Description

    With certain inputs, iconv may write beyond the end of the output buffer.

    III. Impact

    Depending on the way in which iconv is used, an attacker may be able to
    create a denial of service, provoke incorrect program behavior, or induce a remote code execution. iconv is a libc library function and the nature of possible attacks will depend on the way in which iconv is used by
    applications or daemons.

    IV. Workaround

    No workaround is available. Stack canaries (-fstack-protector), which are enabled by default, provide a degreee of defense against code injection but
    not against denial of service.

    V. Solution

    Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Restart any potentially affected daemons.

    Perform one of the following:

    1) To update your vulnerable system via a binary patch:

    Systems running a RELEASE version of FreeBSD on the i386 or amd64
    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-19:09/iconv.patch
    # fetch https://security.FreeBSD.org/patches/SA-19:09/iconv.patch.asc
    # gpg --verify iconv.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

    The following list contains the correction revision numbers for each
    affected branch.

    Branch/path Revision
    - ------------------------------------------------------------------------- stable/12/ r349622 releng/12.0/ r349621 stable/11/ r349624 releng/11.3/ r349621 releng/11.2/ r349621
    - -------------------------------------------------------------------------

    To see which files were modified by a particular revision, run the
    following command, replacing NNNNNN with the revision number, on a
    machine with Subversion installed:

    # 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-2019-5600>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:09.iconv.asc> -----BEGIN PGP SIGNATURE-----

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