critical
9.1
CWE
59
Advisory Published
CVE Published
Updated

CVE-2019-12749

First published: Tue Jun 11 2019(Updated: )

A flaw was discovered in dbus where the implementation of DBUS_COOKIE_SHA1 is susceptible to a symbolic link attack. A malicious client with write access to its own home directory could manipulate a ~/.dbus-keyrings symlink to cause the DBusServer to read and write in unintended locations. This could result in authentication bypass.

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Freedesktop Dbus<1.10.28
Freedesktop Dbus>=1.12.0<1.12.16
Freedesktop Dbus>=1.13.0<1.13.12
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
Canonical Ubuntu Linux=19.04
redhat/dbus<1.10.28
1.10.28
redhat/dbus<1.12.16
1.12.16
redhat/dbus<1.13.12
1.13.12
IBM Security Guardium<=10.5
IBM Security Guardium<=10.6
IBM Security Guardium<=11.0
IBM Security Guardium<=11.1
IBM Security Guardium<=11.2
IBM Security Guardium<=11.3
debian/dbus
1.12.28-0+deb11u1
1.12.24-0+deb11u1
1.14.10-1~deb12u1
1.16.0-1

Remedy

https://gitlab.freedesktop.org/dbus/dbus/uploads/25073ca3ccbcd7839d5c0d8224e42d99/0001-auth-Reject-DBUS_COOKIE_SHA1-for-users-other-than-th.patch

Remedy

https://gitlab.freedesktop.org/dbus/dbus/uploads/1d0109466b4564df1ad093aad2fcebfa/0001-auth-Reject-DBUS_COOKIE_SHA1-for-users-other-than-th.patch

Remedy

https://gitlab.freedesktop.org/dbus/dbus/uploads/10e58a024127b230b142932c79f0a94e/0001-auth-Reject-DBUS_COOKIE_SHA1-for-users-other-than-th.patch

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2019-12749.

  • What is the severity of CVE-2019-12749?

    The severity of CVE-2019-12749 is critical with a severity value of 9.1.

  • What is the affected software for CVE-2019-12749?

    The affected software for CVE-2019-12749 includes dbus versions 1.10.x, 1.12.x, and 1.13.x.

  • How can a remote attacker exploit this vulnerability?

    A remote attacker can exploit this vulnerability through cookie spoofing caused by symlink mishandling in the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library.

  • Is there a fix available for CVE-2019-12749?

    Yes, there are fixes available for CVE-2019-12749. Please refer to the vendor-specific advisories for the appropriate remediation steps.

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