CVE-2020-11939

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Source
https://nvd.nist.gov/vuln/detail/CVE-2020-11939
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-11939.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2020-11939
Downstream
Related
Published
2020-04-23T15:15:14Z
Modified
2025-10-21T05:21:09.090931Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

In nDPI through 3.2 Stable, the SSH protocol dissector has multiple KEXINIT integer overflows that result in a controlled remote heap overflow in concathashstring in ssh.c. Due to the granular nature of the overflow primitive and the ability to control both the contents and layout of the nDPI library's heap memory through remote input, this vulnerability may be abused to achieve full Remote Code Execution against any network inspection stack that is linked against nDPI and uses it to perform network traffic analysis.

References

Affected packages

Git / github.com/ntop/ndpi

Affected ranges

Type
GIT
Repo
https://github.com/ntop/ndpi
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7ce478a58b4dd29a8d1e6f4e9df2f778613d9202

Affected versions

1.*

1.6
1.7
1.8

Database specific

vanir_signatures

[
    {
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
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                "36730755761917650802390084511422679341",
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                "185335030166029547406247007661411730390",
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                "250885279769554835181950345265473491468",
                "303145487143888301726310878257127237580",
                "49179849989099264623126266977899134858",
                "196751063030876352374082677123802447793",
                "80454884451883005323606728084617810275",
                "74250334664598201673095961881215789230",
                "230351351768418757198115691252772704413",
                "199771834766053173464310199541677224437",
                "62589407157362015951869353400318022483",
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                "177197553529436440170169005138441807140",
                "303145487143888301726310878257127237580",
                "49179849989099264623126266977899134858",
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                "80454884451883005323606728084617810275",
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                "306971311188099745823684004607826649980",
                "311468897869830441894343710491978672644",
                "250885279769554835181950345265473491468",
                "303145487143888301726310878257127237580",
                "49179849989099264623126266977899134858",
                "39528483705297221797883597212464487118",
                "279887832145773530318018006419191556265",
                "27337239312858035367681845572483571849",
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                "57272967599891703381530692916475999999",
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                "177197553529436440170169005138441807140",
                "303145487143888301726310878257127237580",
                "49179849989099264623126266977899134858",
                "39528483705297221797883597212464487118",
                "279887832145773530318018006419191556265",
                "27337239312858035367681845572483571849",
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                "85718418905613519250742540026416103130",
                "280420456888903253897954805707563812709"
            ]
        },
        "signature_type": "Line",
        "id": "CVE-2020-11939-76b3bb79",
        "target": {
            "file": "src/lib/protocols/ssh.c"
        },
        "source": "https://github.com/ntop/ndpi/commit/7ce478a58b4dd29a8d1e6f4e9df2f778613d9202",
        "deprecated": false
    },
    {
        "signature_version": "v1",
        "digest": {
            "length": 3519.0,
            "function_hash": "321790383128337468983970469050623318505"
        },
        "signature_type": "Function",
        "id": "CVE-2020-11939-d3e84ed3",
        "target": {
            "file": "src/lib/protocols/ssh.c",
            "function": "concat_hash_string"
        },
        "source": "https://github.com/ntop/ndpi/commit/7ce478a58b4dd29a8d1e6f4e9df2f778613d9202",
        "deprecated": false
    }
]