CVE-2019-12749
Publication date 11 June 2019
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| dbus | ||
| 18.04 LTS bionic |
Fixed 1.12.2-1ubuntu1.1
|
|
| 16.04 LTS xenial |
Fixed 1.10.6-1ubuntu3.4
|
|
| 14.04 LTS trusty |
Fixed 1.6.18-0ubuntu4.5+esm1
|
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Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.1 · High
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-4015-1
- DBus vulnerability
- 11 June 2019
- USN-4015-2
- DBus vulnerability
- 12 June 2019