Grav Server-side Template Injection (SSTI) via Twig Default Filters
CVE-2023-34448

8.8HIGH

Key Information:

Vendor

Getgrav

Status
Grav
Vendor
CVE Published:
14 June 2023

What is CVE-2023-34448?

Grav, a flat-file content management system, is exposed to a server-side template injection vulnerability prior to version 1.7.42. The issue arises from the inadequate patching of CVE-2022-2073, which failed to prevent the invocation of unsafe functions through built-in Twig functionalities. This flaw allows remote code execution risks, as attackers can exploit unsafe functions enabled by the Twig Core Extension. The effective patch implemented in version 1.7.42 restricts access to these functions by validating arguments passed to filter(), specifically the overriding of the map() and reduce() filter functions.

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Deploy the Patch

Affected Version(s)

grav < 1.7.42

References

https://github.com/getgrav/grav/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/getgrav/grav/commit/8c2c1cb72611a399f1...
x_refsource_MISC
https://github.com/twigphp/Twig/blob/v1.44.7/src/Environm...
x_refsource_MISC

EPSS Score

6% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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