systemd: CVE-2018-15687: chown_one() can dereference symlinks

Debian Bug report logs - #912007
systemd: CVE-2018-15687: chown_one() can dereference symlinks

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: systemd: CVE-2018-15687: chown_one() can dereference symlinks

Date: Sat, 27 Oct 2018 09:53:44 +0200

Source: systemd
Version: 239-10
Severity: important
Tags: security upstream
Forwarded: https://github.com/systemd/systemd/pull/10517

Hi,

The following vulnerability was published for systemd.

CVE-2018-15687[0]:
| A race condition in chown_one() of systemd allows an attacker to cause
| systemd to set arbitrary permissions on arbitrary files. Affected
| releases are systemd versions up to and including 239.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2018-15687
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15687
[1] https://bugs.chromium.org/p/project-zero/issues/detail?id=1689
[2] https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1796692
[3] https://github.com/systemd/systemd/pull/10517

Please adjust the affected versions in the BTS as needed, stretch
should be unaffected as the vulnerable feature/code was introduced
later, but plese confirm if possible.

Regards,
Salvatore

Message #8 received at 912007-submitter@bugs.debian.org (full text, mbox, reply):

From: Michael Biebl <biebl@debian.org>

To: 912007-submitter@bugs.debian.org

Subject: Bug #912007 in systemd marked as pending

Date: Sun, 28 Oct 2018 12:02:09 +0000

Control: tag -1 pending

Hello,

Bug #912007 in systemd reported by you has been fixed in the
Git repository and is awaiting an upload. You can see the commit
message below, and you can check the diff of the fix at:

https://salsa.debian.org/systemd-team/systemd/commit/e3696255cf57ec98177b3144f6a3a0b4a8aac0a0

------------------------------------------------------------------------
chown-recursive: Rework the recursive logic to use O_PATH

Fixes a race condition in chown_one() which allows an attacker to cause
systemd to set arbitrary permissions on arbitrary files.

CVE-2018-15687
LP: #1796692
Closes: #912007

------------------------------------------------------------------------

(this message was generated automatically)
-- 
Greetings

https://bugs.debian.org/912007

Message #15 received at 912007-close@bugs.debian.org (full text, mbox, reply):

From: Michael Biebl <biebl@debian.org>

To: 912007-close@bugs.debian.org

Subject: Bug#912007: fixed in systemd 239-11

Date: Sun, 28 Oct 2018 14:48:24 +0000

Source: systemd
Source-Version: 239-11

We believe that the bug you reported is fixed in the latest version of
systemd, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 912007@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Biebl <biebl@debian.org> (supplier of updated systemd package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Sun, 28 Oct 2018 13:02:18 +0100
Source: systemd
Binary: systemd systemd-sysv systemd-container systemd-journal-remote systemd-coredump systemd-tests libpam-systemd libnss-myhostname libnss-mymachines libnss-resolve libnss-systemd libsystemd0 libsystemd-dev udev libudev1 libudev-dev udev-udeb libudev1-udeb
Architecture: source
Version: 239-11
Distribution: unstable
Urgency: high
Maintainer: Debian systemd Maintainers <pkg-systemd-maintainers@lists.alioth.debian.org>
Changed-By: Michael Biebl <biebl@debian.org>
Description:
 libnss-myhostname - nss module providing fallback resolution for the current hostname
 libnss-mymachines - nss module to resolve hostnames for local container instances
 libnss-resolve - nss module to resolve names via systemd-resolved
 libnss-systemd - nss module providing dynamic user and group name resolution
 libpam-systemd - system and service manager - PAM module
 libsystemd-dev - systemd utility library - development files
 libsystemd0 - systemd utility library
 libudev-dev - libudev development files
 libudev1   - libudev shared library
 libudev1-udeb - libudev shared library (udeb)
 systemd    - system and service manager
 systemd-container - systemd container/nspawn tools
 systemd-coredump - tools for storing and retrieving coredumps
 systemd-journal-remote - tools for sending and receiving remote journal logs
 systemd-sysv - system and service manager - SysV links
 systemd-tests - tests for systemd
 udev       - /dev/ and hotplug management daemon
 udev-udeb  - /dev/ and hotplug management daemon (udeb)
Closes: 906429 912007 912008
Changes:
 systemd (239-11) unstable; urgency=high
 .
   [ Michael Biebl ]
   * debian/tests/upstream: Clean up after each test run.
     Otherwise the loopback images used by qemu are not properly released and
     we might run out of disk space.
   * dhcp6: Make sure we have enough space for the DHCP6 option header.
     Fixes out-of-bounds heap write in systemd-networkd dhcpv6 option
     handling.
     (CVE-2018-15688, LP: #1795921, Closes: #912008)
   * chown-recursive: Rework the recursive logic to use O_PATH.
     Fixes a race condition in chown_one() which allows an attacker to cause
     systemd to set arbitrary permissions on arbitrary files.
     (CVE-2018-15687, LP: #1796692, Closes: #912007)
 .
   [ Martin Pitt ]
   * debian/tests/boot-and-services: Use gdm instead of lightdm.
     This seems to work more reliably, on Ubuntu CI's i386 instances lightdm
     fails.
 .
   [ Manuel A. Fernandez Montecelo ]
   * Run "meson test" instead of "ninja test"
     Upstream developers of meson recommend to run it in this way, because
     "ninja test" just calls "meson test", and by using meson directly and
     using extra command line arguments it is possible to control aspects of
     how the tests are run.
   * Increase timeout for test in riscv64.
     The buildds for the riscv64 arch used at the moment are slow, so increase
     the timeouts for this arch by a factor of 10, for good measure.
     (Closes: #906429)
Checksums-Sha1:
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 45f54957dd21e429e78e2d7b987a59a1d5aa3156 154748 systemd_239-11.debian.tar.xz
 84bf5b119ebc4a2689e93f2f0b01a1767bc4b14d 9355 systemd_239-11_source.buildinfo
Checksums-Sha256:
 833a319ba82a62d2ea8e2f53fa9ba5706f442192f9b4ac128e9847da21171d35 4817 systemd_239-11.dsc
 2c99b4f5f200f4603b51f421910056bd7feba510ce0e19b386510b3f73a42e47 154748 systemd_239-11.debian.tar.xz
 53b1fdef5fc6b52f03c0ec17576ca663bec655f3a13da2ffffc6f2156f0f93e4 9355 systemd_239-11_source.buildinfo
Files:
 12288c30403e757d6e46adb5cca13411 4817 admin optional systemd_239-11.dsc
 1a4b9cb7e6e9804f62f1b0dfa6abb1a5 154748 admin optional systemd_239-11.debian.tar.xz
 b1b344e0cb1d00a9dc93ad65a7e6177e 9355 admin optional systemd_239-11_source.buildinfo

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