FreeBSD Errata Notice FreeBSD-EN-21:17.libradius
1 June, 2021 by errata-notices@freebsd.org | freebsd
FreeBSD-EN-21:17.libradius Errata Notice The FreeBSD Project Topic: Incorrect validation in rad_get_attr(3) Category: core Module: libradius Announced: 2021-06-01 Affects: All supported versions of FreeBSD. Corrected: 2021-05-28 17:00:19 UTC (stable/13, 13.0-STABLE) 2021-06-01 20:26:32 UTC (releng/13.0, 13.0-RELEASE-p2) 2021-05-28 17:03:20 UTC (stable/12, 12.2-STABLE) 2021-06-01 20:38:39 UTC (releng/12.2, 12.2-RELEASE-p8) 2021-05-28 17:02:43 UTC (stable/11, 11.4-STABLE) 2021-05-28 20:37:54 UTC (releng/11.4, 11.4-RELEASE-p11) For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background libradius(3) is a client and server library implementing the Remote Authentication Dial In User Service (RADIUS) protocol. It is used by pam_radius(8) and mpd5 (available in the ports tree as net/mpd5). II. Problem Description The patch for FreeBSD-SA-21:12.libradius modified rad_get_attr(3) to verify that an attribute length smaller than the minimum required for the attribute type and length fields is disallowed. This check may fail incorrectly for the final attribute in a RADIUS message. III. Impact The bug may cause request validation to fail when it should succeed. This can result in errors in applications making using of libradius(3). IV. Workaround No workaround is available. Systems not using libradius(3) are unaffected. V. Solution Upgrade your 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 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 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/EN-21:17/libradius.patch # fetch https://security.FreeBSD.org/patches/EN-21:17/libradius.patch.asc # gpg --verify libradius.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/ f9972532343b stable/13-n245792 releng/13.0/ 8acc450613c3 releng/13.0-n244745 stable/12/ r369897 releng/12.2/ r369921 stable/11/ r369896 releng/11.4/ r369919 - ------------------------------------------------------------------------- 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 The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-21:17.libradius.asc>