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Amazon Linux AMI: CVE-2019-12749: Security patch for dbus (ALAS-2019-1246)

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Amazon Linux AMI: CVE-2019-12749: Security patch for dbus (ALAS-2019-1246)

Severity
4
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:N)
Published
06/11/2019
Created
07/29/2019
Added
07/27/2019
Modified
07/27/2019

Description

dbus before 1.10.28, 1.12.x before 1.12.16, and 1.13.x before 1.13.12, as used in DBusServer in Canonical Upstart in Ubuntu 14.04 (and in some, less common, uses of dbus-daemon), allows cookie spoofing because of symlink mishandling in the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. (This only affects the DBUS_COOKIE_SHA1 authentication mechanism.) A malicious client with write access to its own home directory could manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a different uid to read and write in unintended locations. In the worst case, this could result in the DBusServer reusing a cookie that is known to the malicious client, and treating that cookie as evidence that a subsequent client connection came from an attacker-chosen uid, allowing authentication bypass.

Solution(s)

  • amazon-linux-upgrade-dbus

References

  • ALAS-2019-1246
  • USN-4015-1
  • USN-4015-2
  • CVE-2019-12749

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