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Security Advisories: GSA_kwCzR0hTQS02OHZyLThmNDYtdmM5Zs0kfA

Username spoofing in OnionShare

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.

Description:

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.

Technical description:

Assumed users in Chat:

  1. Mallory renames to Alice .
  2. Mallory sends message as Alice .
  3. Alice and Bob receive a message from Mallory disguised as Alice , which is hard to distinguish from the Alice
    in the web interface.

otf-005-a
otf-005-b

Other (invisible) whitespace characters were found to be working as well.

Impact:

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.

Recommendation:

Permalink: https://github.com/advisories/GHSA-68vr-8f46-vc9f
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS02OHZyLThmNDYtdmM5Zs0kfA
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 2 years ago
Updated: about 1 year ago


CVSS Score: 4.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Identifiers: GHSA-68vr-8f46-vc9f, CVE-2022-21696
References: Repository: https://github.com/onionshare/onionshare
Blast Radius: 1.0

Affected Packages

pypi:onionshare-cli
Dependent packages: 0
Dependent repositories: 0
Downloads: last month
Affected Version Ranges: >= 2.3, < 2.5
Fixed in: 2.5
All affected versions:
All unaffected versions: