ALAS-2019-1246


Amazon Linux AMI Security Advisory: ALAS-2019-1246
Advisory Release Date: 2019-07-25 18:48 Pacific
Severity: Medium
References: CVE-2019-12749 

Issue Overview:

dbus as used in DBusServer, 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. (CVE-2019-12749 )


Affected Packages:

dbus


Issue Correction:
Run yum update dbus to update your system.

New Packages:
i686:
    dbus-devel-1.6.12-14.29.amzn1.i686
    dbus-debuginfo-1.6.12-14.29.amzn1.i686
    dbus-libs-1.6.12-14.29.amzn1.i686
    dbus-1.6.12-14.29.amzn1.i686

noarch:
    dbus-doc-1.6.12-14.29.amzn1.noarch

src:
    dbus-1.6.12-14.29.amzn1.src

x86_64:
    dbus-libs-1.6.12-14.29.amzn1.x86_64
    dbus-devel-1.6.12-14.29.amzn1.x86_64
    dbus-debuginfo-1.6.12-14.29.amzn1.x86_64
    dbus-1.6.12-14.29.amzn1.x86_64