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GHSA-j422-qmxp-hv94
No affected components available
Summary
A path traversal vulnerability has been identified in Grav CMS, versions 1.7.49.5 , allowing authenticated attackers
with administrative privileges to read arbitrary files on the underlying server filesystem. This vulnerability arises due
to insufficient input sanitization in the backup tool, where user-supplied paths are not properly restricted, enabling
access to files outside the intended webroot directory. The impact of this vulnerability depends on the privileges of
the user account running the application.
PoC
To accurately demonstrate the maximum potential impact of this vulnerability, the testing environment was configured in a specific way:
- Elevated Privileges: The application was run locally with the highest possible system privileges, operating under the **`root`** user account.
- Objective: This configuration was chosen to unequivocally show that the path traversal vulnerability is not just a theoretical issue but can lead to a complete compromise of the underlying host when combined with poor operational practices. The ability to read any file on the system is the ultimate test of the flaw's severity.
Proof of Concept Goal: Under these conditions, the subsequent PoC will exploit the vulnerability to read the SSH private key
of the `root` user (`/root/.ssh/id_rsa`). The successful exfiltration of this key represents a worst-case scenario, as it would provide
an attacker with persistent, undetectable, and complete administrative access to the host server. This highlights the critical intersection
of an application-layer vulnerability and a infrastructure-level misconfiguration.
1- LOGIN AS ADMIN AND GO TO : http://127.0.0.1/admin/tools/backups
2- Change 'Root Folder' to backup directory /../../../../../../../root/.ssh/
3- CLICK : 'SAVE'
4- CLICK : 'Backup Now'
5- Extract Backup :
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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