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improve the text a bit

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Wladimir J. van der Laan 2015-10-12 14:34:32 +02:00
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_alerts/2015-10-12-upnp-vulnerability.md
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@ -16,29 +16,31 @@ bannerclass: "alert"
Either
- turn off the checkbox in the GUI under Options → Network → Map port using UPNP (see above)
- add `-upnp=0` to the command line options
- add the line `upnp=0` to your `bitcoin.conf` file
- add `-upnp=0` to the command line options
Alternatively, upgrade to a version of Bitcoin Core at least 0.10.3 or 0.11.1.
These versions upgrade the library to a non-vulnerable version, as well as have
upnp disabled by default to prevent this problem in the future.
These versions upgrade the library to a non-vulnerable version, as well as
disable UPnP by default to prevent this problem in the future.
## Details
Version before 1.9.20151008 of the miniupnpc library are vulnerable to a buffer
overflow in the XML parser during initial network discovery. The
vulnerable code triggers at startup of Bitcoin Core if upnp is enabled.
vulnerable code triggers at startup of Bitcoin Core if UPnP is enabled.
Details of the vulnerability can be found here: http://talosintel.com/reports/TALOS-2015-0035/
It has been verified that the vulnerability can be used to crash the application at startup.
It has been verified that the vulnerability can be used to crash the
application at startup by running a malicious UPnP server on the local
network.
To have more connectable nodes, the Bitcoin Core executables distributed by
bitcoin.org include the library and have always had UPnP functionality enabled
by default.
bitcoin.org include the miniupnpc library and have always had UPnP
functionality enabled by default, to forward the P2P port.
This applies to the distributed executables only, not when building from source or
using distribution provided packages. Self-built executables have UPnP disabled
This applies to the distributed executables only, not those built from source or
from distribution provided packages. Self-built executables have UPnP disabled
by default, unless `--enable-upnp-default` was provided to the configure script.
Releases starting from 0.10.3 and 0.11.1, and the upcoming 0.12.0 will still ship