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.

Affected: npm: angular-expressions

### Impact

The vulnerability, reported by GoSecure Inc, allows Remote Code Execution, if you call `expressions.compile(userControlledInput)` where `userControlledInput` is text that comes from user input.

This time, the security of the package could be bypassed by using a more complex payload, using a `.constructor.constructor` technique.

* 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.

### Patches

Users should upgrade to version 1.1.2 of angular-expressions

### Workarounds

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 :

```js if (/^[|a-zA-Z.0-9 :"'+-?]+$/.test(userControlledInput)) { var result = expressions.compile(userControlledInput); } else { result = undefined; } ```

### References

[Removal of angular-expression sandbox](http://blog.angularjs.org/2016/09/angular-16-expression-sandbox-removal.html)

### For more information

If you have any questions or comments about this advisory: * Open an issue in [angular-expressions](https://github.com/peerigon/angular-expressions/issues) * [Email us](mailto:contact@javascript-ninja.fr)

### Credits

The iss…