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 learningUpgrade serialize-javascript
to version 3.1.0 or higher.
serialize-javascript is a package to serialize JavaScript to a superset of JSON that includes regular expressions and functions.
Affected versions of this package are vulnerable to Arbitrary Code Injection. An object like {"foo": /1"/, "bar": "a\"@__R-<UID>-0__@"}
would be serialized as {"foo": /1"/, "bar": "a\/1"/}
, meaning an attacker could escape out of bar
if they controlled both foo
and bar
and were able to guess the value of <UID>
. UID is generated once on startup, is chosen using Math.random()
and has a keyspace of roughly 4 billion, so within the realm of an online attack.
eval('('+ serialize({"foo": /1" + console.log(1)/i, "bar": '"@__R-<UID>-0__@'}) + ')');