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CVE-2022-42012: security - dbus denial of service: CVE-2022-42010, -42011, -42012
An issue was discovered in D-Bus before 1.12.24, 1.13.x and 1.14.x before 1.14.4, and 1.15.x before 1.15.2. An authenticated attacker can cause dbus-daemon and other programs that use libdbus to crash by sending a message with attached file descriptors in an unexpected format.
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Date: Thu, 6 Oct 2022 09:52:53 +0100 From: Simon McVittie <smcv@…ian.org> To: oss-security@…ts.openwall.com Cc: dbus-security@…ts.freedesktop.org Subject: dbus denial of service: CVE-2022-42010, -42011, -42012
dbus is the reference implementation of D-Bus, a message bus for communication between applications and system services.
Evgeny Vereshchagin discovered several ways in which an authenticated local attacker could cause a crash (denial of service) in dbus-daemon --system or a custom DBusServer. In uncommon configurations these could potentially be carried out by an authenticated remote attacker.
Fixed versions:
* dbus 1.14.x >= 1.14.4 (stable branch) * dbus 1.12.x >= 1.12.24 (old stable branch) * dbus >= 1.15.2 (development branch)
Older dbus branches such as 1.10.x are EOL and will not receive new upstream releases.
Vulnerable versions:
* dbus 1.15.x before 1.15.2 * dbus 1.14.x before 1.14.4 * all versions before 1.12.24
CVE-2022-42010 is believed to have been introduced during early dbus development (before 1.0) and the other two vulnerabilities mentioned here were regressions in 1.3.0.
Vulnerability details:
* An invalid array of fixed-length elements where the length of the array is not a multiple of the length of the element would cause an assertion failure in debug builds or an out-of-bounds read in production builds. This was a regression in version 1.3.0. (dbus#413, CVE-2022-42011, fixed by https://gitlab.freedesktop.org/dbus/dbus/-/commit/079bbf16186e87fb0157adf8951f19864bc2ed69)
* A syntactically invalid type signature with incorrectly nested parentheses and curly brackets would cause an assertion failure in debug builds. Similar messages could potentially result in a crash or incorrect message processing in a production build, although we are not aware of a practical example. (dbus#418, CVE-2022-42010, fixed by https://gitlab.freedesktop.org/dbus/dbus/-/commit/9d07424e9011e3bbe535e83043d335f3093d2916)
* A message in non-native endianness with out-of-band Unix file descriptors would cause a use-after-free and possible memory corruption in production builds, or an assertion failure in debug builds. This was a regression in version 1.3.0. (dbus#417, CVE-2022-42012, fixed by https://gitlab.freedesktop.org/dbus/dbus/-/commit/236f16e444e88a984cf12b09225e0f8efa6c5b44)
Reimplementations of the D-Bus protocol such as systemd’s sd-bus (used in dbus-broker and systemd) and GLib’s GDBus (used in gvfs and ibus) do not share dbus’ code for message parsing and validation, so they are probably unaffected by these issues.
– Simon McVittie, Collabora Ltd. / Debian on behalf of the dbus maintainers
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