GHSA-qmqw-mpqp-mr54 CVE-2015-4050
Symfony Incorrect Access Control
- Severity
- Medium
- The publisher's own rating, not a CVSS score
- Exploit chance (EPSS)
- 8.21%
- Chance of exploitation in the next 30 days. Higher than 94.88% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-284 Improper Access Control
- Fix
- Available
- 2 packages have a fixed version
Description
FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment.
This issue has been fixed in Symfony 2.3.29, 2.5.12, and 2.6.8. Note that no fixes are provided for Symfony 2.4 as it's not maintained anymore.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| symfony/http-kernel | >= 2.3.19, < 2.3.29 |
2.3.29 |
| symfony/http-kernel | >= 2.5.4, < 2.5.12 |
2.5.12 |
| symfony/http-kernel | >= 2.6.0, < 2.6.8 |
2.6.8 |
| symfony/http-kernel | >= 2.4.9, <= 2.4.10 |
No fix yet |
| symfony/symfony | >= 2.3.19, < 2.3.29 |
2.3.29 |
| symfony/symfony | >= 2.4.9, <= 2.4.10 |
No fix yet |
| symfony/symfony | >= 2.5.4, < 2.5.12 |
2.5.12 |
| symfony/symfony | >= 2.6.0, < 2.6.8 |
2.6.8 |
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.
symfony/http-kernel Packagist → 2.3.29
- composer
composer require symfony/http-kernel:^2.3.29
symfony/symfony Packagist → 2.3.29
- composer
composer require symfony/symfony:^2.3.29
Weakness
CWE-284: Improper Access Control
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
How to prevent it
- Architecture and Design, Operation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
- Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
References
Advisories
Other links
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE…
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-201…
- symfony.com/cve-2015-4050
- web.archive.org/web/20200228090443/http://www.securityfocus.com/bid/74928
- lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html
- lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html
- lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html
- symfony.com/blog/cve-2015-4050-esi-unauthorized-access
- debian.org/security/2015/dsa-3276
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-2v3c-qxhr-7vpv Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process | High | Also affects symfony/symfony |
| GHSA-r925-mgvr-h9cc Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header | High | Also affects symfony/symfony |
| GHSA-h5x3-xfc9-m39h Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization | Medium | Also affects symfony/symfony |
| GHSA-v3wm-qf9p-c549 Symfony: HtmlSanitizer URL Parser Deny Gates Underinclusive: Percent-Encoded BiDi Marks and Unicode Whitespace Bypass Visual-Spoofing Defense | Medium | Also affects symfony/symfony |
| GHSA-rrj9-5q2j-4gvr Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade | Medium | Also affects symfony/symfony |
| GHSA-38cx-cq6f-5755 Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient | High | Also affects symfony/symfony |
| GHSA-6h46-9jf5-q59x Symfony: Security Firewall Bypass via failure_forward Subrequest: Unauthenticated Access to access_control-Protected GET Routes | High | Also affects symfony/symfony |
| GHSA-x5qj-865h-mgvm Symfony: HtmlSanitizer UrlAttributeSanitizer Misses URL Attributes | Medium | Also affects symfony/symfony |
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