GHSA-x62q-p736-3997 CVE-2025-66303
Grav is vulnerable to a DOS on the admin panel
- Severity
- 4.9 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.39%
- Chance of exploitation in the next 30 days. Higher than 32.83% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-400 Uncontrolled Resource Consumption
- Fix
1.8.0-beta.27- Upgrade getgrav/grav to this version or later
Description
DOS on the admin panel
Severity Rating: Medium
Vector: Denial Of Service
CVE: XXX
CWE: 400 - Uncontrolled Resource Consumption
CVSS Score: 4.9
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Analysis
A Denial of Service (DoS) vulnerability has been identified in the application related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations.
The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression
Proof of Concept
-
Change the value of
scheduled_atparameter to'as shown in the following figures at thehttp://127.0.0.1/admin/toolsendpoint, and observe the response in the second figure: gravdos2 Figure: Http request on tool endpoint gravdos3 Figure: Http response on tool endpoint -
When trying to access the admin panel, the panel is broken as shown in the following figure. Additionally, the value change is reflected in the
backup.yamlfile, as shown in the second figure: gravdos4 Figure: Error message view gravdos5 Figure: Backup.yaml file
Workarounds
No workaround is currently known
Timeline
2024-07-24 Issue identified
2024-09-27 Vendor contacted
About X41 D-Sec GmbH
X41 is an expert provider for application security services. Having extensive industry experience and expertise in the area of information security, a strong core security team of world class security experts enables X41 to perform premium security services.
Fields of expertise in the area of application security are security centered code reviews, binary reverse engineering and vulnerability discovery. Custom research and IT security consulting and support services are core competencies of X41.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| getgrav/grav | < 1.8.0-beta.27 |
1.8.0-beta.27 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
getgrav/grav Packagist → 1.8.0-beta.27
- composer
composer require getgrav/grav:^1.8.0-beta.27
Severity breakdown
CVSS 3.1 4.9
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-400: Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
How to prevent it
- Architecture and Design: Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
- Architecture and Design: Mitigation of resource exhaustion attacks requires that the target system either: recognizes the attack and denies that user further access for a given amount of time, or uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed. The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question. The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- Architecture and Design: Ensure that protocols have specific limits of scale placed on them.
- Implementation: Ensure that all failures in resource allocation place the system into a safe posture.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-xjw5-q542-3vmr Grav: config_denied_paths default list omits `system`, exposing real secrets (e.g. system.cache.redis.password) via the Twig sandbox when config_access is enabled | High | Also affects getgrav/grav |
| GHSA-3jhr-mxmx-38cx Grav: UserInterface offsetget/offsetexists allow-listed in Twig sandbox let editor-authored content leak hashed_password and 2FA secrets via offsetGet() | Medium | Also affects getgrav/grav |
| GHSA-9ccq-2jfg-qw33 Grav: Origin validation bypass in Uri::referrer() and Pages::referrerRoute() via unanchored prefix match | Critical | Also affects getgrav/grav |
| GHSA-38p6-h87p-r4cg Grav: Non constant time nonce comparison in Utils::verifyNonce() used for CSRF protection | Medium | Also affects getgrav/grav |
| GHSA-p597-crqc-m349 Grav: The system, site, and theme Twig variables bypass the content sandbox entirely and are never covered by config_denied_paths | Medium | Also affects getgrav/grav |
| GHSA-47ch-6w46-6xm7 Grav: media_directory() Twig function allows filesystem path traversal and file content disclosure from sandboxed page content | Medium | Also affects getgrav/grav |
| GHSA-jq29-c7v8-rg55 Grav: Path Traversal in MediaUploadTrait::deleteFile() Allows Arbitrary File Deletion | High | Also affects getgrav/grav |
| GHSA-8hgv-xc77-jmcr Grav: Page editors can inject arbitrary script into rendered pages via the Twig sandbox's assets.addJs/addCss allowlist, escalating to super-admin | Medium | Also affects getgrav/grav |
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