GHSA-25gq-jvx2-vg9x
Silverstripe X-Forwarded-Host request hostname injection
- Severity
- 7.2 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- —
- No score published
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
- Fix
3.1.13- Upgrade silverstripe/framework to this version or later
Description
A potential hostname injection vulnerability has been found which could allow attackers to alter url resolution.
If a request contains the X-Forwarded-Host HTTP header a website would then use its value in place of the actual HTTP hostname. In cases where caching is enabled, this could allow an attacker to potentially embed a remote url as the base_url for any site. This would then cause other visitors to the site to be redirected unknowingly.
This header is necessary for servers running behind a reverse proxy (such as nginx). Such servers are likely not vulnerable to this risk.
A fix has been merged into the default installer, although existing projects which do not run behind a reverse proxy should update their htaccess as below:
<IfModule mod_headers.c>
# Remove X-Forwarded-Host header sent as a part of any request from the web
RequestHeader unset X-Forwarded-Host
</IfModule>
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| silverstripe/framework | >= 3.1.0, < 3.1.13 |
3.1.13 |
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.
silverstripe/framework Packagist → 3.1.13
- composer
composer require silverstripe/framework:^3.1.13
Severity breakdown
CVSS 3.1 7.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Weakness
CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
How to prevent it
- Implementation: Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue." Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright. Use a list of approved URLs or domains to be used for redirection.
- Architecture and Design: Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
- Architecture and Design: When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs. For example, ID 1 could map to "/login.asp" and ID 2 could map to "http://www.example.com/". Features such as the ESAPI AccessReferenceMap [REF-45] provide this capability.
- Architecture and Design: Ensure that no externally-supplied requests are honored by requiring that all redirect requests include a unique nonce generated by the application [REF-483]. Be sure that the nonce is not predictable (CWE-330).
- Architecture and Design, Implementation: Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls. Many open redirect problems occur because the programmer assumed that certain inputs could not be modified, such as cookies and hidden form fields.
- Operation: Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
References
Packages
Other links
Timeline
- Published
- Last updated by the source
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-gvrw-qqp5-jgc5 Silverstripe Framework: Possible XSS attack through media embed | Medium | Also affects silverstripe/framework |
| GHSA-256q-hx8w-xcqx Silverstripe Framework user enumeration via timing attack on login and password reset forms | Medium | Also affects silverstripe/framework |
| GHSA-rhx4-hvx9-j387 Silverstripe Framework has a XSS vulnerability in HTML editor | Medium | Also affects silverstripe/framework |
| GHSA-74j9-xhqr-6qv3 Reflected Cross Site Scripting (XSS) in error message | Low | Also affects silverstripe/framework |
| GHSA-mqf3-qpc3-g26q Silverstripe Framework has a Reflected Cross Site Scripting (XSS) in error message | Low | Also affects silverstripe/framework |
| GHSA-ff6q-3c9c-6cf5 Silverstripe Framework has a XSS in form messages | Medium | Also affects silverstripe/framework |
| GHSA-7cmp-cgg8-4c82 Silverstripe Framework has a XSS via insert media remote file oembed | Medium | Also affects silverstripe/framework |
| GHSA-52cw-pvq9-9m5v Silverstripe uses TinyMCE which allows svg files linked in object tags | Medium | Also affects silverstripe/framework |
MergeHarbor checks every repository's dependencies against this database, ranks what matters by exploitability and reachability, routes it to the owning team and opens the fix pull request.
Check your repos with MergeHarbor