7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.006 Low
EPSS
Percentile
78.0%
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
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.
Do not use the return values of each
, each_value
, or each_pair
in your
application.
CPE | Name | Operator | Version |
---|---|---|---|
actionpack | le | 6.0.3 | |
actionpack | le | 5.2.4.2 |
lists.opensuse.org/opensuse-security-announce/2020-09/msg00089.html
lists.opensuse.org/opensuse-security-announce/2020-09/msg00093.html
lists.opensuse.org/opensuse-security-announce/2020-09/msg00107.html
github.com/advisories/GHSA-8727-m6gj-mc37
github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2020-8164.yml
groups.google.com/forum/#!topic/rubyonrails-security/f6ioe4sdpbY
groups.google.com/g/rubyonrails-security/c/f6ioe4sdpbY
hackerone.com/reports/292797
lists.debian.org/debian-lts-announce/2020/06/msg00022.html
lists.debian.org/debian-lts-announce/2020/07/msg00013.html
nvd.nist.gov/vuln/detail/CVE-2020-8164
www.debian.org/security/2020/dsa-4766
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.006 Low
EPSS
Percentile
78.0%