made me aware of this misstep and I am writing to convey very sincere apologies for any oversight in crediting your work. “My name is Larkin Ryder and I am currently serving as the interim Chief Security Officer here at Slack. ![]() In addition to this vulnerability, the researcher identified a Cross-Site Scripting (XSS) flaw in that could lead to arbitrary HTML content being displayed in *. and phishing attacks via fake HTML login pages, but which could also be abused to store the RCE exploit.ĭetails on the security bug became public only last week, after the researcher discovered that Slack had addressed the bug (through the introduction of a sandbox) without crediting his work and complained about that on HackerOne. Once the payload is triggered, the attacker gains access to private conversations and files on Slack, as well as to private files on the system, private keys, passwords, secrets, internal network access, and more.įurthermore, the payload could be designed to be wormable, meaning that it would be automatically re-posted to all user workspaces after click. Vegeris notes that an attacker looking to exploit the flaw would need to upload on their server a file containing the RCE payload, then create a Slack post that contains HTML injection code and post that to a channel or send it to a specific user, to achieve one-click remote code execution. This report demonstrates a specifically crafted exploit consisting of an HTML injection, security control bypass and a RCE JavaScript payload,” the researcher explained. “With any in-app redirect – logic/open redirect, HTML or JavaScript injection – it’s possible to execute arbitrary code within Slack desktop apps. The issue was discovered by security engineer Oskars Vegeris of Evolution Gaming, who reported it in January 2020 via the company’s bug bounty program on HackerOne. A security researcher was awarded a $1,750 bug bounty reward for discovering a remote code execution vulnerability in the Slack desktop applications.Īn attacker could exploit the vulnerability to execute arbitrary code within Slack’s desktop apps for macOS, Linux, and Windows.
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