GHSA-fmqq-hw9m-448q CVE-2020-12469
Subrion CMS PHP Object Injection
Medium
Packagist
- Severity
- 6.5 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.86%
- Chance of exploitation in the next 30 days. Higher than 58.64% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-502 Deserialization of Untrusted Data
- Fix
- None yet
- No fixed version published
Description
admin/blocks.php in Subrion CMS through 4.2.1 allows PHP Object Injection (with resultant file deletion) via serialized data in the subpages value within a block to blocks/edit.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| intelliants/subrion | <= 4.2.1 |
No fix yet |
How to fix
No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.
Severity breakdown
CVSS 3.1 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Weakness
CWE-502: Deserialization of Untrusted Data
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
How to prevent it
- Architecture and Design, Implementation: If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.
- Implementation: When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.
- Implementation: Explicitly define a final object() to prevent deserialization.
- Architecture and Design, Implementation: Make fields transient to protect them from deserialization. An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
- Implementation: Avoid having unnecessary types or gadgets (a sequence of instances and method invocations that can self-execute during the deserialization process, often found in libraries) available that can be leveraged for malicious ends. This limits the potential for unintended or unauthorized types and gadgets to be leveraged by the attacker. Add only acceptable classes to an allowlist. Note: new gadgets are constantly being discovered, so this alone is not a sufficient mitigation.
- Architecture and Design, Implementation: Employ cryptography of the data or code for protection. However, it's important to note that it would still be client-side security. This is risky because if the client is compromised then the security implemented on the client (the cryptography) can be bypassed.
- 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
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-wrcg-234w-hfhq Subrion CMS vulnerable to Cross-site Scripting | Low | Also affects intelliants/subrion |
| GHSA-9jjm-mc56-3qxv Subrion CMS vulnerable to cross-site scripting | Medium | Also affects intelliants/subrion |
| GHSA-h8wv-vv58-468h Subrion CMS: Authenticated administrators are able to gain escalated access through Run SQL Query tool | Low | Also affects intelliants/subrion |
| GHSA-q4qh-8pxw-r48q Subrion CMS vulnerable to Cross Site Scripting | Medium | Also affects intelliants/subrion |
| GHSA-2x28-c7j7-23gv Subrion remote command execution vulnerability | High | Also affects intelliants/subrion |
| GHSA-646r-8fcc-p82r Subrion CMS vulnerable to Cross-site Scripting | Medium | Also affects intelliants/subrion |
| GHSA-7vff-rv2f-cj79 Subrion CMS Cross-site Scripting vulnerability | Medium | Also affects intelliants/subrion |
| GHSA-q832-2275-rfqh Subrion CMS XSS in /panel/configuration/financial/ | Medium | Also affects intelliants/subrion |
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