CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
68.7%
Symfony 2.7.0 to 2.7.47, 2.8.0 to 2.8.40, 3.3.0 to 3.3.16, 3.4.0 to 3.4.10, and 4.0.0 to 4.0.10 versions of the Symfony Security component are affected by this security issue.
The issue has been fixed in Symfony 2.7.48, 2.8.41, 3.3.17, 3.4.11, and 4.0.11. 4.1.0 has also been fixed before its final release.
Note that no fixes are provided for Symfony 3.0, 3.1, and 3.2 as they are not maintained anymore.
By default, a userβs session is invalidated when the user is logged out. This behavior can be disabled through the invalidate_session
option. In this case, CSRF tokens where not erased during logout which allowed for CSRF token fixation.
We fixed this issue by clearing all CSRF tokens when the user is logged out.
I would like to thank KΓ©vin Liagre for reporting this security issue, Christian Flothmann for working on a fix, and the Symfony Core Team for reviewing the patch.
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Published in #Security Advisories
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
68.7%