CVE-2019-12795

daemon/gvfsdaemon.c in gvfsd from GNOME gvfs before 1.38.3, 1.40.x before 1.40.2, and 1.41.x before 1.41.3 opened a private D-Bus server socket without configuring an authorization rule. A local attacker could connect to this server socket and issue D-Bus method calls. (Note that the server socket only accepts a single connection, so the attacker would have to discover the server and connect to the socket before its owner does.)

Weakness

During installation, installed file permissions are set to allow anyone to modify those files.

Affected Software

Potential Mitigations

• Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
• Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/1.html
• https://cwe.mitre.org/data/definitions/127.html
• https://cwe.mitre.org/data/definitions/81.html

References

• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00008.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00009.html
• http://www.securityfocus.com/bid/108741
• https://access.redhat.com/errata/RHSA-2019:3553
• https://gitlab.gnome.org/GNOME/gvfs/commit/70dbfc68a79faac49bd3423e079cb6902522082a
• https://gitlab.gnome.org/GNOME/gvfs/commit/d8c9138bf240975848b1c54db648ec4cd516a48f
• https://gitlab.gnome.org/GNOME/gvfs/commit/e3808a1b4042761055b1d975333a8243d67b8bfe
• https://lists.debian.org/debian-lts-announce/2019/06/msg00014.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP6BFQUPQRVRRFIYHFWWB6RHJNEB4LGQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M2DQVOL5H5BVLXYCEB763DCIYJQ7ZUQ2/
• https://usn.ubuntu.com/4053-1/