Path traversal in Slack Nebula

Published: 2020-04-08 | Updated: 2020-04-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-11498
Exploitation vector Network
Public exploit N/A
Vulnerable software
Web applications / Modules and components for CMS

Vendor Slack Technologies, Inc.

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 09.04.2020

Changed bulletin status to patched.

1) Path traversal

EUVDB-ID: #VU26721

Risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-11498

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No


The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in "tun_darwin.go" and "tun_windows.go" file. A remote authenticated attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Successful exploitation of this vulnerability may lead to remote code execution.


Install update from vendor's website.

Vulnerable software versions

Nebula: 1.0.0 - 1.1.0

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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