CVE-2022-21695 Improper Access Control in Onionshare

What is CVE-2022-21695?

CVE-2022-21695 is a medium-severity missing authorization vulnerability in onionshare, published on 18 Jan 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. In affected versions authenticated users (or unauthenticated in public mode) can send messages without being visible in the list of chat participants. This issue has been resolved in version 2.5.

Weakness: CWE-287

Which versions are affected by CVE-2022-21695?

3 open source packages ship an affected version, including onionshare-cli. It affects 1 product.

Products include Onionshare Onionshare.

How do I fix CVE-2022-21695?

Upgrade onionshare-cli to 2.5 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2022-21695 being exploited?

There is no known exploitation of CVE-2022-21695 in the wild and no public exploit code.

Other vulnerabilities in onionshare

• CVE-2021-41868 Remote unauthenticated attackers able to upload files in Onionshare Critical 9.8
• CVE-2022-21690 Cross-Site Scripting in Onionshare High 8.7
• CVE-2022-21688 Out-of-bounds Read in Onionshare High 7.5
• CVE-2022-21689 Denial of Service in Onionshare High 7.5
• CVE-2018-19960 Path traversal in n/a High 7.0

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2022-21695, GHSA-99p8-9p2c-49j4, PYSEC-2022-46.