Ecosyste.ms: Advisories

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.

• Vulnerability ID: OTF-005
• Vulnerability type: Improper Input Sanitization
• Threat level: Low

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:

• Alice
• Bob
• Mallory

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.

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:

• Remove non-visible characters from the username

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: over 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:

• https://github.com/onionshare/onionshare/security/advisories/GHSA-68vr-8f46-vc9f
• https://nvd.nist.gov/vuln/detail/CVE-2022-21696
• https://github.com/onionshare/onionshare/releases/tag/v2.5
• https://github.com/advisories/GHSA-68vr-8f46-vc9f

Repository: https://github.com/onionshare/onionshare
Blast Radius: 1.0

Affected Packages