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githubGitHub Advisory DatabaseGHSA-G4M9-5HPF-HX72
HistoryMar 30, 2020 - 8:09 p.m.

Firewall configured with unanimous strategy was not actually unanimous in Symfony

2020-03-3020:09:44
CWE-285
GitHub Advisory Database
github.com
45

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

5.5 Medium

CVSS2

Access Vector

Access Complexity

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:S/C:P/I:P/A:N

0.001 Low

EPSS

Percentile

40.4%

Description

On Symfony before 4.4.0, when a Firewall checks an access control rule (using the unanimous strategy), it iterates over all rule attributes and grant access only if all calls to the accessDecisionManager decide to grant access.

As of Symfony 4.4.0, a bug was introduced that prevents the check of attributes as soon as accessDecisionManager decide to grant access on one attribute.

Resolution

The accessDecisionManager is now called with all attributes at once, allowing the unanimous strategy being applied on each attribute.

The patch for this issue is available here for the 4.4 branch.

Credits

I would like to thank Antonio J. GarcΓ­a Lagar for reporting & Robin Chalas for fixing the issue.

Affected configurations

Vulners
Node
symfonytwigRange<5.0.7
OR
symfonytwigRange<4.4.7
OR
symfonytwigRange<5.0.7
OR
symfonytwigRange<4.4.7
OR
symfonytwigRange<5.0.7
OR
symfonytwigRange<4.4.7

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

5.5 Medium

CVSS2

Access Vector

Access Complexity

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:S/C:P/I:P/A:N

0.001 Low

EPSS

Percentile

40.4%