CVE-2021-42717

ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.

References

Affected packages

Git / github.com/owasp-modsecurity/modsecurity

Affected ranges

Type

GIT

Repo

https://github.com/owasp-modsecurity/modsecurity

Events

Introduced

c1cd668acb820824e791ba802396c60900eae9c1

Fixed

c3d7f4b560797a052681dcffb97a22bb906487cd

Database specific

{
    "versions": [
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.0.6"
        }
    ]
}

Affected versions

v3.*

v3.0.0

v3.0.1

v3.0.2

v3.0.3

v3.0.4

v3.0.5

Database specific

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "2.0.0"
            },
            {
                "fixed": "2.9.5"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "r24"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "r25"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "9.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "11.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "12.2.1.3.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "12.2.1.4.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "8.8"
            }
        ]
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-42717.json"