Arbitary file upload
CVE-2020-26286

7.5HIGH

Key Information:

Vendor

Hedgedoc

Status
Hedgedoc
Vendor
CVE Published:
29 December 2020

What is CVE-2020-26286?

HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an unauthenticated attacker can upload arbitrary files to the upload storage backend including HTML, JS and PHP files. The problem is patched in HedgeDoc 1.7.1. You should however verify that your uploaded file storage only contains files that are allowed, as uploaded files might still be served. As workaround it's possible to block the /uploadimage endpoint on your instance using your reverse proxy. And/or restrict MIME-types and file names served from your upload file storage.

Affected Version(s)

hedgedoc < 1.7.1

References

https://github.com/hedgedoc/hedgedoc/security/advisories/...
x_refsource_CONFIRM
https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1
x_refsource_MISC
https://github.com/hedgedoc/hedgedoc/commit/e9306991cdb5f...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.