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GHSA-8727-m6gj-mc37
No affected components available
There is a strong parameters bypass vector in ActionPack.
Versions Affected: rails <= 6.0.3 Not affected: rails < 5.0.0 Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1
Impact
In some cases user supplied information can be inadvertently leaked from
Strong Parameters. Specifically the return value of each, or each_value,
or each_pair will return the underlying "untrusted" hash of data that was
read from the parameters. Applications that use this return value may be
inadvertently use untrusted user input.
Impacted code will look something like this:
def update
# Attacker has included the parameter: `{ is_admin: true }`
User.update(clean_up_params)
end
def clean_up_params
params.each { |k, v| SomeModel.check(v) if k == :name }
end
Note the mistaken use of each in the clean_up_params method in the above
example.
Workarounds
Do not use the return values of each, each_value, or each_pair in your
application.
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.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
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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