[SECURITY] [DLA 2596-1] shadow security update
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2596-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Sylvain Beucler
March 17, 2021 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------
Package : shadow
Version : 1:4.4-4.1+deb9u1
CVE ID : CVE-2017-12424 CVE-2017-20002
Debian Bug : 756630 914957
Several vulnerabilities were discovered in the shadow suite of login
tools. An attacker may escalate privileges in specific configurations.
CVE-2017-20002
Shadow incorrectly lists pts/0 and pts/1 as physical terminals in
/etc/securetty. This allows local users to login as password-less
users even if they are connected by non-physical means such as SSH
(hence bypassing PAM's nullok_secure configuration). This notably
affects environments such as virtual machines automatically
generated with a default blank root password, allowing all local
users to escalate privileges. It should be noted however that
/etc/securetty will be dropped in Debian 11/bullseye.
CVE-2017-12424
The newusers tool could be made to manipulate internal data
structures in ways unintended by the authors. Malformed input may
lead to crashes (with a buffer overflow or other memory
corruption) or other unspecified behaviors. This crosses a
privilege boundary in, for example, certain web-hosting
environments in which a Control Panel allows an unprivileged user
account to create subaccounts.
For Debian 9 stretch, these problems have been fixed in version
1:4.4-4.1+deb9u1.
We recommend that you upgrade your shadow packages.
For the detailed security status of shadow please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/shadow
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
-----BEGIN PGP SIGNATURE-----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=Nqeb
-----END PGP SIGNATURE-----
Reply to: