Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `SafeBuffer#%` does not propagate the `@html_unsafe` flag to the newly created buffer. If a `SafeBuffer` is mutated in place (e.g. via `gsub!`) and then formatted with `%` using untrusted arguments, the result incorrectly reports `html_safe? == true`, bypassing ERB auto-escaping and possibly leading to XSS.
Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 3
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Rubyonrails Rails
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
|
— |
7.2.3.1
|
|
Rubyonrails Rails
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
|
8.0.0
|
8.0.4.1
|
|
Rubyonrails Rails
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
|
8.1.0
|
8.1.2.1
|
References 7
https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7
security-advisories@github.com
https://github.com/rails/rails/commit/6e8a81108001d58043de9e54a06fca58962fc2db
security-advisories@github.com
https://github.com/rails/rails/commit/c1ad0e8e1972032f3395853a5e99cea035035beb
security-advisories@github.com
https://github.com/rails/rails/releases/tag/v7.2.3.1
security-advisories@github.com
https://github.com/rails/rails/releases/tag/v8.0.4.1
security-advisories@github.com
https://github.com/rails/rails/releases/tag/v8.1.2.1
security-advisories@github.com
https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v
security-advisories@github.com