[ASA-202106-51] matrix-appservice-irc: insufficient validation
diabonas at archlinux.org
Thu Jun 24 16:20:17 UTC 2021
Arch Linux Security Advisory ASA-202106-51
Date : 2021-06-22
CVE-ID : CVE-2021-32659
Package : matrix-appservice-irc
Type : insufficient validation
Remote : Yes
Link : https://security.archlinux.org/AVG-2076
The package matrix-appservice-irc before version 0.27.0-1 is vulnerable
to insufficient validation.
Upgrade to 0.27.0-1.
# pacman -Syu "matrix-appservice-irc>=0.27.0-1"
The problem has been fixed upstream in version 0.27.0.
As a workaround, disabling the automatic room upgrade handling can be
done by removing the `roomUpgradeOpts` key from the `Bridge` class
In versions 2.6.0 and earlier of matrix-appservice-bridge, as included
in matrix-appservice-irc before version 0.27.0, if a bridge has room
upgrade handling turned on in the configuration (the `roomUpgradeOpts`
key when instantiating a new `Bridge` instance.), any
`m.room.tombstone` event it encounters will be used to unbridge the
current room and bridge into the target room. However, the target room
`m.room.create` event is not checked to verify if the `predecessor`
field contains the previous room. This means that any malicious admin
of a bridged room can repoint the traffic to a different room without
the new room being aware. Versions 2.6.1 and greater are patched. As a
workaround, disabling the automatic room upgrade handling can be done
by removing the `roomUpgradeOpts` key from the `Bridge` class options.
A malicious admin of a bridged room can repoint the traffic to a
different room without the new room being aware.
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