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CVE-2021-25971
Date: October 20, 2021
Overview
In Camaleon CMS, versions 2.0.1 to 2.6.0 are vulnerable to an Uncaught Exception. The app's media upload feature crashes permanently when an attacker with a low privileged access uploads a specially crafted .svg fileDetails
Camaleon CMS’s Media upload feature crashes permanently when an attacker with low privilege access uploads an .svg filePoC Details
In a private window, create a sample account. Go to Profile, Change Photo and upload a crafted SVG file with contents such as given below.Now in a normal window, login as an administrator user. Go to the Media tab on the right. We can see a crash which is permanent and no user can now upload any image nor change their picture.
PoC Code
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
</svg>Affected Environments
Camaleon CMS versions 2.0.1 to 2.6.0Prevention
Update to camaleon_cms version 2.6.0.1Language: Ruby
Good to know:
| Base Score: |
|
|---|---|
| Attack Vector (AV): | Network |
| Attack Complexity (AC): | Low |
| Privileges Required (PR): | Low |
| User Interaction (UI): | None |
| Scope (S): | Unchanged |
| Confidentiality (C): | None |
| Integrity (I): | None |
| Availability (A): | Low |
| Base Score: |
|
|---|---|
| Access Vector (AV): | Network |
| Access Complexity (AC): | Low |
| Authentication (AU): | Single |
| Confidentiality (C): | None |
| Integrity (I): | None |
| Availability (A): | Partial |
| Additional information: |