5 Medium
CVSS2
Attack Vector
NETWORK
Attack 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
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
0.974 High
EPSS
Percentile
99.9%
There is a possible directory traversal and information leak vulnerability
in Action View. This was meant to be fixed on CVE-2016-0752. However the 3.2
patch was not covering all the scenarios. This vulnerability has been
assigned the CVE identifier CVE-2016-2097.
Versions Affected: 3.2.x, 4.0.x, 4.1.x
Not affected: 4.2+
Fixed Versions: 3.2.22.2, 4.1.14.2
Applications that pass unverified user input to the render
method in a
controller may be vulnerable to an information leak vulnerability.
Impacted code will look something like this:
def index
render params[:id]
end
Carefully crafted requests can cause the above code to render files from
unexpected places like outside the applicationβs view directory, and can
possibly escalate this to a remote code execution attack.
All users running an affected release should either upgrade or use one of the
workarounds immediately.
The FIXED releases are available at the normal locations.
A workaround to this issue is to not pass arbitrary user input to the render
method. Instead, verify that data before passing it to the render
method.
For example, change this:
def index
render params[:id]
end
To this:
def index
render verify_template(params[:id])
end
private
def verify_template(name)
# add verification logic particular to your application here
end
To aid users who arenβt able to upgrade immediately we have provided patches
for it. It is in git-am format and consist of a single changeset.
Thanks to both Jyoti Singh and Tobias Kraze from makandra for reporting this
and working with us in the patch!
CPE | Name | Operator | Version |
---|---|---|---|
actionpack | lt | 4.1.0 | |
actionpack | le | 3.2.22.1 | |
actionpack | ge | 3.2.23.0 | |
actionpack | le | 4.1.13 | |
actionpack | ge | 4.2.0 | |
actionpack | lt | 4.1.14.2 |
5 Medium
CVSS2
Attack Vector
NETWORK
Attack 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
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
0.974 High
EPSS
Percentile
99.9%