Joe Vennix discovered an authentication bypass vulnerability in dbus, an asynchronous inter-process communication system. The implementation of the DBUS_COOKIE_SHA1 authentication mechanism was susceptible to a symbolic link attack. A local attacker could take advantage of this flaw

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Debian Security Advisory DSA-4462-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
June 13, 2019                         https://www.debian.org/security/faq
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Package        : dbus
CVE ID         : CVE-2019-12749
Debian Bug     : 930375

Joe Vennix discovered an authentication bypass vulnerability in dbus, an
asynchronous inter-process communication system. The implementation of
the DBUS_COOKIE_SHA1 authentication mechanism was susceptible to a
symbolic link attack. A local attacker could take advantage of this flaw
to bypass authentication and connect to a DBusServer with elevated
privileges.

The standard system and session dbus-daemons in their default
configuration are not affected by this vulnerability.

The vulnerability was addressed by upgrading dbus to a new upstream
version 1.10.28 which includes additional fixes.

For the stable distribution (stretch), this problem has been fixed in
version 1.10.28-0+deb9u1.

We recommend that you upgrade your dbus packages.

For the detailed security status of dbus please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/dbus

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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