Vulnerability identifier: #VU19274

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12749

CWE-ID: CWE-287

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
D-Bus
Client/Desktop applications / Messaging software

Vendor: Freedesktop.org

Description

The vulnerability allows a an attacker to bypass authentication process.

The vulnerability exists due to an error when handling symlinks within the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. A malicious client with access to to its own home directory can manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a different uid to read and write into unintended locations.

Successful exploitation of the vulnerability may allow an attacker to bypass DBUS_COOKIE_SHA1 authentication mechanis.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

D-Bus: 1.13.0 - 1.13.10, 1.12.0 - 1.12.14, 1.10.0 - 1.10.26

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External links
http://www.openwall.com/lists/oss-security/2019/06/11/2
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V2CQF37O73VH2JDVX2ILX2KD2KLXLQOU/
http://seclists.org/bugtraq/2019/Jun/16
http://www.openwall.com/lists/oss-security/2019/06/11/2

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.