CVE-2019-12749 is a high-severity vulnerability affecting dbus versions before 1.10.28, 1.12.16, and 1.13.12, as well as Canonical Upstart in Ubuntu 14.04. It involves cookie spoofing due to symlink mishandling in the DBUS_COOKIE_SHA1 authentication mechanism, allowing a malicious client with local write access to its home directory to manipulate a ~/.dbus-keyrings symlink. This could lead to a DBusServer reusing a known cookie, potentially enabling authentication bypass by tricking the server into believing a connection originates from an attacker-chosen UID. The vulnerability has a CVSS score of 7.1 (High) with low attack complexity and local privileges required, but no user interaction. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.10.28CPE matchmatch criteria | cpe:2.3:a:freedesktop:dbus:*:*:*:*:*:*:*:* | ||
>= 1.12.0, < 1.12.16CPE matchmatch criteria | cpe:2.3:a:freedesktop:dbus:*:*:*:*:*:*:*:* | ||
>= 1.13.0, < 1.13.12CPE matchmatch criteria | cpe:2.3:a:freedesktop:dbus:*:*:*:*:*:*:*:* | ||
16.04CPE matchmatch criteria | cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | ||
18.04CPE matchmatch criteria | cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
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.
Jun 11, 2019dbus: DBusServer DBUS_COOKIE_SHA1 authentication bypass
Jun 11, 2019