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
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6 Medium
AI Score
Confidence
High
0.011 Low
EPSS
Percentile
84.4%
Symfony 2.7.0 to 2.7.49, 2.8.0 to 2.8.48, 3.0.0 to 3.4.19, 4.0.0 to 4.0.14, 4.1.0 to 4.1.8 and 4.2.0 versions of the Symfony Form component are affected by this security issue.
The issue has been fixed in Symfony 2.7.50, 2.8.49, 3.4.20, 4.0.15, 4.1.9 and 4.2.1.
Note that no fixes are provided for Symfony 3.0, 3.1, 3.2 and 3.3 as they are not maintained anymore.
When using the scalar type hint string
in a setter method (e.g. setName(string $name)
) of a class thatβs the data_class
of a form, and when a file upload is submitted to the corresponding field instead of a normal text input, then UploadedFile::__toString()
is called which will then return and disclose the path of the uploaded file. If combined with a local file inclusion issue in certain circumstances this could escalate it to a Remote Code Execution.
File uploads are filtered out of formβs data when the corresponding form type doesnβt explicitly allow them.
The patch for this issue is available here for branch 2.7.
I would like to thank David Gorges of LeapHub GmbH for reporting the issue and Nicolas Grekas for fixing it.
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Published in #Security Advisories
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
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6 Medium
AI Score
Confidence
High
0.011 Low
EPSS
Percentile
84.4%