CVE-2019-12749

LOW

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

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/2019/06/11/2

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

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

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

https://lists.fedoraproject.org/archives/list/[email protected]/message/V2CQF37O73VH2JDVX2ILX2KD2KLXLQOU/

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

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

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

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

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

Details

Source: MITRE

Published: 2019-06-11

Updated: 2019-06-14

Type: CWE-287

Risk Information

CVSS v2.0

Base Score: 3.6

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

Impact Score: 4.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3.0

Base Score: 7.1

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

Impact Score: 5.2

Exploitability Score: 1.8

Severity: HIGH