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Vulnerability Details : CVE-2019-12749

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.
Publish Date : 2019-06-11 Last Update Date : 2020-08-24
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2019:1726: dbus security update (Important) oval:com.redhat.rhsa:def:20191726 unix
RHSA-2019:3707: dbus security update (Moderate) oval:com.redhat.rhsa:def:20193707 unix
RHSA-2020:4032: dbus security update (Moderate) oval:com.redhat.rhsa:def:20204032 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2019-12749

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 16.04 * * * Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 18.04 * * * Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 18.10 * * * Version Details Vulnerabilities
4 OS Canonical Ubuntu Linux 19.04 * * * Version Details Vulnerabilities
5 Application Freedesktop Dbus * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 4
Freedesktop Dbus 1

- References For CVE-2019-12749
SUSE openSUSE-SU-2019:1604
SUSE openSUSE-SU-2019:1671
REDHAT RHSA-2019:2870
REDHAT RHSA-2019:2868
GENTOO GLSA-201909-08[email protected]/message/V2CQF37O73VH2JDVX2ILX2KD2KLXLQOU/
FEDORA FEDORA-2019-d5ded5326b
REDHAT RHSA-2019:1726
SUSE openSUSE-SU-2019:1750
BID 108751 Dbus CVE-2019-12749 Authentication Bypass Vulnerability Release Date:2019-06-11
MLIST [debian-lts-announce] 20190614 [SECURITY] [DLA 1818-1] dbus security update
BUGTRAQ 20190613 [SECURITY] [DSA 4462-1] dbus security update
MLIST [oss-security] 20190611 CVE-2019-12749: DBusServer DBUS_COOKIE_SHA1 authentication bypass
REDHAT RHSA-2019:3707

- Metasploit Modules Related To CVE-2019-12749

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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