CVE-2019-12749

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://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/[email protected]/message/V2CQF37O73VH2JDVX2ILX2KD2KLXLQOU/

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

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

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

Risk Information

CVSS v2

CVSS v3