CVE-2021-21277 Angular Expressions - Remote Code Execution
Attackers can execute arbitrary code by injecting malicious payloads into user-controlled input processed by the angular-expressions library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-21277?
CVE-2021-21277 is a high-severity code injection vulnerability in peerigon angular-expressions, published on 1 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
angular-expressions is "angular's nicest part extracted as a standalone module for the browser and node". In angular-expressions before version 1.1.2 there is a vulnerability which allows Remote Code Execution if you call "expressions.compile(userControlledInput)" where "userControlledInput" is text that comes from user input. The security of the package could be bypassed by using a more complex payload, using a ".constructor.constructor" technique. In terms of impact: If running angular-expressions in the browser, an attacker could run any browser script when the application code calls expressions.compile(userControlledInput). If running angular-expressions on the server, an attacker could run any Javascript expression, thus gaining Remote Code Execution. This is fixed in version 1.1.2 of angular-expressions A temporary workaround might be either to disable user-controlled input that will be fed into angular-expressions in your application or allow only following characters in the userControlledInput.
Which versions are affected by CVE-2021-21277?
2 open source packages ship an affected version, including angular-expressions. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
angular-expressions npm | All versions | 1.1.2 |
angular-expressions npm | All versions | 1.1.2 |
Products include Peerigon Angular-Expressions.
How do I fix CVE-2021-21277?
Upgrade angular-expressions to 1.1.2 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-21277 being exploited?
There is no known exploitation of CVE-2021-21277 in the wild and no public exploit code.
Other vulnerabilities in peerigon angular-expressions
Sources
Also known as GHSA-j6px-jwvv-vpwq.