dbus up to 1.10.27/1.12.15/1.13.11 /.dbus-keyrings improper authentication

Summaryinfo

A vulnerability was found in dbus up to 1.10.27/1.12.15/1.13.11 and classified as critical. This vulnerability affects unknown code of the file /.dbus-keyrings. The manipulation results in improper authentication. This vulnerability is reported as CVE-2019-12749. The attack requires a local approach. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in dbus up to 1.10.27/1.12.15/1.13.11. It has been classified as critical. Affected is an unknown code of the file /.dbus-keyrings. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was disclosed 06/11/2019 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is traded as CVE-2019-12749 since 06/06/2019. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 266270 (NewStart CGSL MAIN 6.06 : dbus Multiple Vulnerabilities (NS-SA-2025-0231)), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176984 (Debian Security Update for dbus (DSA 4462-1)).

Upgrading to version 1.10.28, 1.12.16 or 1.13.12 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (266270). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• dbus

Version

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3
• 1.10.4
• 1.10.5
• 1.10.6
• 1.10.7
• 1.10.8
• 1.10.9
• 1.10.10
• 1.10.11
• 1.10.12
• 1.10.13
• 1.10.14
• 1.10.15
• 1.10.16
• 1.10.17
• 1.10.18
• 1.10.19
• 1.10.20
• 1.10.21
• 1.10.22
• 1.10.23
• 1.10.24
• 1.10.25
• 1.10.26
• 1.10.27
• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.12.4
• 1.12.5
• 1.12.6
• 1.12.7
• 1.12.8
• 1.12.9
• 1.12.10
• 1.12.11
• 1.12.12
• 1.12.13
• 1.12.14
• 1.12.15
• 1.13.0
• 1.13.1
• 1.13.2
• 1.13.3
• 1.13.4
• 1.13.5
• 1.13.6
• 1.13.7
• 1.13.8
• 1.13.9
• 1.13.10
• 1.13.11

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion