Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in org.webjars.bower:qs

Summary

The qs package as used in Express through 4.17.3 and other products, allows attackers to cause a Node process hang for an Express application because an "__ proto__ key" can be used. In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as "a[__proto__]=b&a[__proto__]&a[length]=100000000". This vulnerability affects qs versions through 6.2.3, 6.3.0 through 6.3.2, 6.4.0, 6.5.0 through 6.5.2, 6.6.0, 6.7.0 through 6.7.2, 6.8.0 through 6.8.2, 6.9.0 through 6.9.6 and 6.10.0 through 6.10.2 (and therefore Express 4.17.3, which has "deps: [email protected]" in its release description, is not vulnerable).