Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freedesktop | Dbus | < 1.10.28 |
| Canonical | Ubuntu Linux | 16.04 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00059.html
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00092.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00026.html
- http://www.openwall.com/lists/oss-security/2019/06/11/2Mailing ListMitigationThird Party Advisory
- http://www.securityfocus.com/bid/108751
- https://access.redhat.com/errata/RHSA-2019:1726
- https://access.redhat.com/errata/RHSA-2019:2868
- https://access.redhat.com/errata/RHSA-2019:2870
- https://access.redhat.com/errata/RHSA-2019:3707
- https://lists.debian.org/debian-lts-announce/2019/06/msg00005.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://seclists.org/bugtraq/2019/Jun/16
- https://security.gentoo.org/glsa/201909-08
- https://usn.ubuntu.com/4015-1/Third Party Advisory
- https://usn.ubuntu.com/4015-2/
FAQ
What is CVE-2019-12749?
CVE-2019-12749 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 spoofin...
How severe is CVE-2019-12749?
CVE-2019-12749 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-12749?
Check the references section above for vendor advisories and patch information. Affected products include: Freedesktop Dbus, Canonical Ubuntu Linux.