Date: Thu, 6 Oct 2022 10:53:15 -0400 From: Demi Marie Obenour <demi@...isiblethingslab.com> To: oss-security@...ts.openwall.com Cc: dbus-security@...ts.freedesktop.org Subject: Re: dbus denial of service: CVE-2022-42010, -42011, -42012 On Thu, Oct 06, 2022 at 09:52:53AM +0100, Simon McVittie wrote: > 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) Is the memory corruption potentially exploitable for local privilege escalation? > 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. Are clients using libdbus vulnerable if they are behind dbus-broker? -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)
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