PT-2021-16808 · Onlyoffice · Onlyoffice Document Server

Published 2021-03-01 · Updated 2021-10-29 · CVE-2021-25833

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions ONLYOFFICE DocumentServer versions 4.2.0.71 through 5.6.0.21

Description A file extension handling issue was found in the server module of ONLYOFFICE DocumentServer. The file extension can be controlled by an attacker through the request data, leading to arbitrary file overwriting. This issue allows a remote attacker to obtain remote code execution on DocumentServer.

Recommendations For versions 4.2.0.71 through 5.6.0.21, consider restricting access to the server module until a patch is available. As a temporary workaround, avoid using the vulnerable file extension handling functionality in the request data. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2021-25833

Affected Products

Onlyoffice Document Server

References · 11

• 🔥 https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25833 · Exploit
• https://github.com/ONLYOFFICE/DocumentServer · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-25833 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-25833 · Security Note
• https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L593 · Note
• https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L283 · Note
• https://github.com/ONLYOFFICE/server · Note
• https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterservice.js#L200 · Note
• https://t.me/cibsecurity/24296 · Telegram Post
• https://t.me/cvenotify/10703 · Telegram Post
• https://t.me/cybersecuritytechnologies/4625 · Telegram Post