GHSA-hwmh-9jj9-8c9c CVE-2019-10642
Contao CSRF Token Bypass
High
Packagist
- Severity
- 8.8 / 10
- High · CVSS 3.0
- Exploit chance (EPSS)
- 0.50%
- Chance of exploitation in the next 30 days. Higher than 42.81% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-352 Cross-Site Request Forgery (CSRF)
- Fix
- Available
- 2 packages have a fixed version
Description
Security researcher Ali Razzaq has discovered that the request token check can be bypassed in Contao 4.7
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| contao/contao | >= 4.7.0, < 4.7.3 |
4.7.3 |
| contao/core-bundle | >= 4.7.0, < 4.7.3 |
4.7.3 |
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.
contao/contao Packagist → 4.7.3
- composer
composer require contao/contao:^4.7.3
contao/core-bundle Packagist → 4.7.3
- composer
composer require contao/core-bundle:^4.7.3
Severity breakdown
CVSS 3.0 8.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Weakness
CWE-352: Cross-Site Request Forgery (CSRF)
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
How to prevent it
- Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482]. For example, use anti-CSRF packages such as the OWASP CSRFGuard. [REF-330] Another example is the ESAPI Session Management control, which includes a component for CSRF. [REF-45]
- Implementation: Ensure that the application is free of cross-site scripting issues (CWE-79), because most CSRF defenses can be bypassed using attacker-controlled script.
- Architecture and Design: Generate a unique nonce for each form, place the nonce into the form, and verify the nonce upon receipt of the form. Be sure that the nonce is not predictable (CWE-330). [REF-332]
- Architecture and Design: Identify especially dangerous operations. When the user performs a dangerous operation, send a separate confirmation request to ensure that the user intended to perform that operation.
- Architecture and Design: Use the "double-submitted cookie" method as described by Felten and Zeller: When a user visits a site, the site should generate a pseudorandom value and set it as a cookie on the user's machine. The site should require every form submission to include this value as a form value and also as a cookie value. When a POST request is sent to the site, the request should only be considered valid if the form value and the cookie value are the same. Because of the same-origin policy, an attacker cannot read or modify the value stored in the cookie. To successfully submit a form on behalf of the user, the attacker would have to correctly guess the pseudorandom value. If the pseudorandom value is cryptographically strong, this will be prohibitively difficult. This technique requires Javascript, so it may not work for browsers that have Javascript disabled. [REF-331]
- Architecture and Design: Do not use the GET method for any request that triggers a state change.
- Implementation: Check the HTTP Referer header to see if the request originated from an expected page. This could break legitimate functionality, because users or proxies may have disabled sending the Referer for privacy reasons.
References
Advisories
Packages
Other links
- github.com/contao/contao/commit/ee2c8130c2e68a1d0d2e75bd6b774c4393942b15
- contao.org/en/news.html
- contao.org/en/news/security-vulnerability-cve-2019-10642.html
- github.com/FriendsOfPHP/security-advisories/blob/master/contao/contao/CVE-2019-…
- github.com/FriendsOfPHP/security-advisories/blob/master/contao/core-bundle/CVE-…
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-9ff2-p842-45wq Contao: Cross-site request forgery in custom backend actions | Low | Also affects contao/core-bundle |
| GHSA-q6wp-fr43-gm9v Contao: Improper access control in the preview links module | Medium | Also affects contao/core-bundle |
| GHSA-5974-gfqc-wrcm Contao: Improper access control in the table access voter | Medium | Also affects contao/core-bundle |
| GHSA-mrvp-7wmx-5m4h Contao: Path traversal in the images controller | Medium | Also affects contao/core-bundle |
| GHSA-mfxh-vp55-7gc6 Contao: The registration module re-sends activation mails | Medium | Also affects contao/core-bundle |
| GHSA-x2rp-9qf7-2fmq Contao: Protected page content is disclosed to anonymous visitors after contao.search.index_protected is disabled | Medium | Also affects contao/core-bundle |
| GHSA-grm4-wm43-9jh5 Contao: Possible path traversal in job download URIs | Low | Also affects contao/contao |
| GHSA-87mg-5grr-rhwh Contao: Server-Side Request Forgery (SSRF) via Unvalidated RSS Feed URL in Feed Reader Module | Low | Also affects contao/contao |
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