| Package | Affected versions | Patched versions |
|---|---|---|
| onionshare-cli | ≥ 2.3, < 2.5< 2.5 | 2.5 |
| onionshare | < 2.5 | 2.5 |
Between September 26, 2021 and October 8, 2021, Radically Open Security conducted a penetration test of OnionShare 2.4, funded by the Open Technology Fund's Red Team lab. This is an issue from that penetration test.
It is possible to change the username to that of another chat participant with an additional space character at the end of the name string.
Assumed users in Chat:
Alice .Alice .Alice , which is hard to distinguish from the Alice
in the web interface.
Other (invisible) whitespace characters were found to be working as well.
An adversary with access to the chat environment can use the rename feature to impersonate other participants by adding whitespace characters at the end of the username.
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