Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXA0cGotOWc1OS00cHB2

Remote Code Execution in SyliusResourceBundle

Impact

Request parameters injected inside an expression evaluated by symfony/expression-language package haven't been sanitized properly. This allows the attacker to access any public service by manipulating that request parameter, allowing for Remote Code Execution.

The vulnerable versions include: <=1.3.13 || >=1.4.0 <=1.4.6 || >=1.5.0 <=1.5.1 || >=1.6.0 <=1.6.3.

Example

foo:
    path: /foo/{id}
    defaults:
        _sylius:
            repository:
                method: findSome
                arguments:
                    entity: "expr:service('repository').find($id)"

In this case, $id can be prepared in a way that calls other services.

If you visit /foo/"~service('doctrine').getManager().getConnection().executeQuery("DELETE * FROM TABLE")~", it will result in a following expression expr:service('repository').find(""~service('doctrine').getManager().getConnection().executeQuery("DELETE * FROM TABLE")~""), which will execute a query on the currently connected database.

To find a vulnerability in your application, look for any routing definition that uses request parameters inside expression language.

Patches

This issue has been patched for versions 1.3.14, 1.4.7, 1.5.2 and 1.6.4. Versions prior to 1.3 were not patched.

Workarounds

The fix requires adding addslashes in ParametersParser::parseRequestValueExpression to sanitize user input before evaluating it using the expression language.

- return is_string($variable) ? sprintf('"%s"', $variable) : $variable;
+ return is_string($variable) ? sprintf('"%s"', addslashes($variable)) : $variable;

Acknowledgements

This security issue has been reported by Craig Blanchette (@isometriks), thanks a lot!

For more information

If you have any questions or comments about this advisory:

• Email us at [email protected]

Permalink: https://github.com/advisories/GHSA-p4pj-9g59-4ppv
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXA0cGotOWc1OS00cHB2
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 4 years ago
Updated: 11 months ago

CVSS Score: 7.7
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

EPSS Percentage: 0.00507
EPSS Percentile: 0.763

Identifiers: GHSA-p4pj-9g59-4ppv, CVE-2020-15143
References:

• https://github.com/Sylius/SyliusResourceBundle/security/advisories/GHSA-p4pj-9g59-4ppv
• https://nvd.nist.gov/vuln/detail/CVE-2020-15143
• https://github.com/Sylius/SyliusResourceBundle/commit/73ed8b8bb083f36c30ad7c3cec336f65d6a80650
• https://github.com/FriendsOfPHP/security-advisories/blob/master/sylius/resource-bundle/CVE-2020-15143.yaml
• https://github.com/advisories/GHSA-p4pj-9g59-4ppv

Repository: https://github.com/Sylius/SyliusResourceBundle
Blast Radius: 20.7

Affected Packages