In short
- CVE-2020-5219 is a HIGH (CVSS 8.8) vulnerability affecting angular-expressions (peerigon), angular-expressions.
- Chance of exploitation in the next 30 days (EPSS): 2.4%, higher than 84.0% of all vulnerabilities.
- Fix: update to 1.0.1 or later.
Description
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.
- 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 1.0.1 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 :
if (/^[|a-zA-Z.0-9 :"'+-?]+$/.test(userControlledInput)) {
var result = expressions.compile(userControlledInput);
}
else {
result = undefined;
}
References
Removal of angular-expression sandbox
For more information
If you have any questions or comments about this advisory:
Credits
The issue was reported by Maxime Nadeau from GoSecure, Inc.
NVD description
Angular Expressions before version 1.0.1 has a remote code execution vulnerability if you call expressions.compile(userControlledInput) where userControlledInput is text that comes from user input. 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.
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