CVE-2019-12749

high

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.

References

https://www.openwall.com/lists/oss-security/2019/06/11/2

https://www.debian.org/security/2019/dsa-4462

https://usn.ubuntu.com/4015-2/

https://usn.ubuntu.com/4015-1/

https://security.gentoo.org/glsa/201909-08

https://seclists.org/bugtraq/2019/Jun/16

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2CQF37O73VH2JDVX2ILX2KD2KLXLQOU/

https://lists.debian.org/debian-lts-announce/2019/06/msg00005.html

https://access.redhat.com/errata/RHSA-2019:3707

https://access.redhat.com/errata/RHSA-2019:2870

https://access.redhat.com/errata/RHSA-2019:2868

https://access.redhat.com/errata/RHSA-2019:1726

http://www.securityfocus.com/bid/108751

http://www.openwall.com/lists/oss-security/2019/06/11/2

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00026.html

http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00092.html

http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00059.html

Details

Source: Mitre, NVD

Published: 2019-06-11

Risk Information

CVSS v2

Base Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:N

Severity: Low

CVSS v3

Base Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Severity: High