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GHSA-7rq6-7gv8-c37h
No affected components available
Dashboard UI in Hangfire.Core uses authorization filters to protect it from showing sensitive data to unauthorized users. By default when no custom authorization filters specified, LocalRequestsOnlyAuthorizationFilter filter is being used to allow only local requests and prohibit all the remote requests to provide sensible, protected by default settings.
However due to the recent changes, in version 1.7.25 no authorization filters are used by default, allowing remote requests to succeed.
Impact
Missing authorization when default options are used for the Dashboard UI, e.g. when no custom authorization rules are used as recommended in the Using Dashboard documentation article.
Impacted
If you are using UseHangfireDashboard method with default DashboardOptions.Authorization property value, then your installation is impacted:
app.UseHangfireDashboard(); // Impacted
app.UseHangfireDashboard("/hangfire", new DashboardOptions()); // Impacted
Not Impacted
If any other authorization filter is specified in the DashboardOptions.Authorization property, the you are not impacted:
app.UseHangfireDashboard("/hangfire", new DashboardOptions
{
Authorization = new []{ new SomeAuthorizationFilter(); } // Not impacted
});
Patches
Patch is already available in version 1.7.26 and already available on NuGet.org, please see Hangfire.Core 1.7.26. Default authorization rules now prohibit remote requests by default again by including the LocalRequestsOnlyAuthorizationFilter filter to the default settings. Please upgrade to the newest version in order to mitigate the issue.
Workarounds
It is possible to fix the issue by using the LocalRequestsOnlyAuthorizationFilter explicitly when configuring the Dashboard UI. In this case upgrade is not required.
// using Hangfire.Dashboard;
app.UseHangfireDashboard("/hangfire", new DashboardOptions
{
Authorization = new []{ new LocalRequestsOnlyAuthorizationFilter(); }
});
References
Original GitHub Issue: https://github.com/HangfireIO/Hangfire/issues/1958
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. No user interaction is needed for the attacker to exploit this vulnerability. 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 low 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 very low. The vulnerability is unlikely 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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