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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>
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