Debian Bug report logs -
#890557
shadow: CVE-2018-7169: unprivileged user can drop supplementary groups
Reported by: Salvatore Bonaccorso <carnil@debian.org>
Date: Thu, 15 Feb 2018 21:33:01 UTC
Severity: important
Tags: security, upstream
Found in versions shadow/1:4.4-4.1, shadow/1:4.2-3, shadow/1:4.5-1
Reply or subscribe to this bug.
Toggle useless messages
Report forwarded
to debian-bugs-dist@lists.debian.org, carnil@debian.org, team@security.debian.org, secure-testing-team@lists.alioth.debian.org, team@security.debian.org, Shadow package maintainers <pkg-shadow-devel@lists.alioth.debian.org>:
Bug#890557; Package src:shadow.
(Thu, 15 Feb 2018 21:33:04 GMT) (full text, mbox, link).
Acknowledgement sent
to Salvatore Bonaccorso <carnil@debian.org>:
New Bug report received and forwarded. Copy sent to carnil@debian.org, team@security.debian.org, secure-testing-team@lists.alioth.debian.org, team@security.debian.org, Shadow package maintainers <pkg-shadow-devel@lists.alioth.debian.org>.
(Thu, 15 Feb 2018 21:33:04 GMT) (full text, mbox, link).
Message #5 received at submit@bugs.debian.org (full text, mbox, reply):
Source: shadow
Version: 1:4.5-1
Severity: important
Tags: security upstream
Hi,
the following vulnerability was published for shadow.
CVE-2018-7169[0]:
| An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is
| setuid and allows an unprivileged user to be placed in a user namespace
| where setgroups(2) is permitted. This allows an attacker to remove
| themselves from a supplementary group, which may allow access to
| certain filesystem paths if the administrator has used "group
| blacklisting" (e.g., chmod g-rwx) to restrict access to paths. This
| flaw effectively reverts a security feature in the kernel (in
| particular, the /proc/self/setgroups knob) to prevent this sort of
| privilege escalation.
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-2018-7169
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7169
[1] https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357
Please adjust the affected versions in the BTS as needed.
Regards,
Salvatore
Marked as found in versions shadow/1:4.4-4.1.
Request was from Salvatore Bonaccorso <carnil@debian.org>
to control@bugs.debian.org.
(Thu, 15 Feb 2018 21:39:06 GMT) (full text, mbox, link).
Marked as found in versions shadow/1:4.2-3.
Request was from Salvatore Bonaccorso <carnil@debian.org>
to control@bugs.debian.org.
(Thu, 15 Feb 2018 21:39:11 GMT) (full text, mbox, link).
Send a report that this bug log contains spam.
Debian bug tracking system administrator <owner@bugs.debian.org>.
Last modified:
Wed Jun 19 13:34:41 2019;
Machine Name:
buxtehude
Debian Bug tracking system
Debbugs is free software and licensed under the terms of the GNU
Public License version 2. The current version can be obtained
from https://bugs.debian.org/debbugs-source/.
Copyright © 1999 Darren O. Benham,
1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson,
2005-2017 Don Armstrong, and many other contributors.
Vulmon