Improper Control of Generation of Code ('Code Injection')
CVE-2023-34253
Summary
Grav is a file-based Web platform. In getgrav/grav versions prior to 1.7.42, the denylist introduced in commit 9d6a2d to prevent dangerous functions from being executed via injection of malicious templates was insufficient and could be easily subverted in multiple ways using unsafe functions that are not banned, using capitalized callable names, and using fully-qualified names for referencing callables. Consequently, a low-privileged attacker with login access to the Grav Admin panel and page creation/update permissions is able to inject malicious templates to obtain Remote Code Execution.
- LOW
- NETWORK
- HIGH
- UNCHANGED
- NONE
- HIGH
- HIGH
- HIGH
CWE-94 - Code Injection
Code injection is a type of vulnerability that allows an attacker to execute arbitrary code. This vulnerability fully compromises the machine and can cause a wide variety of security issues, such as unauthorized access to sensitive information, manipulation of data, denial of service attacks etc. Code injection is different from command injection in the fact that it is limited by the functionality of the injected language (e.g. PHP), as opposed to command injection, which leverages existing code to execute commands, usually within the context of a shell.
References
Advisory Timeline
- Published
