#VU49234 Arbitrary file upload in HedgeDoc - CVE-2020-26286

Vulnerability identifier: #VU49234

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-26286

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
HedgeDoc
Client/Desktop applications / Other client software

Vendor: HedgeDoc

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload. A remote attacker can upload a malicious file and execute it on the server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

HedgeDoc: 0.3.3 - 1.7.0

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External links
https://github.com/hedgedoc/hedgedoc/commit/e9306991cdb5ff2752c1eeba3fedba42aec3c2d8
https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1
https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-wcr3-xhv7-8gxc

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.