Vulnerability-Lookup

FKIE_CVE-2016-3957

Vulnerability from fkie_nvd - Published: 2018-02-06 18:29 - Updated: 2026-06-17 00:46

Severity

9.8 (Critical) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

The secure_load function in gluon/utils.py in web2py before 2.14.2 uses pickle.loads to deserialize session information stored in cookies, which might allow remote attackers to execute arbitrary code by leveraging knowledge of encryption_key.

References

URL	Tags
cve@mitre.org	https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/	Exploit, Technical Description, Third Party Advisory
cve@mitre.org	https://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200	Third Party Advisory
cve@mitre.org	https://usn.ubuntu.com/4030-1/
af854a3a-2127-422b-91ae-364da2661108	https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/	Exploit, Technical Description, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://usn.ubuntu.com/4030-1/

Impacted products

	Vendor	Product	Version
	web2py	web2py	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:web2py:web2py:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AFE64C05-496E-4D7D-A659-5F376D249FAC",
              "versionEndExcluding": "2.14.2",
              "vulnerable": true
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  "descriptions": [
    {
      "lang": "en",
      "value": "The secure_load function in gluon/utils.py in web2py before 2.14.2 uses pickle.loads to deserialize session information stored in cookies, which might allow remote attackers to execute arbitrary code by leveraging knowledge of encryption_key."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n secure_load en gluon/utils.py en web2py, en versiones anteriores a la 2.14.2, emplea pickle.loads para deserializar informaci\u00f3n de sesi\u00f3n almacenada en cookies. Esto podr\u00eda permitir que atacantes remotos ejecuten c\u00f3digo arbitrario aprovechando el conocimiento de encryption_key."
    }
  ],
  "id": "CVE-2016-3957",
  "lastModified": "2026-06-17T00:46:38.307",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": true,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2018-02-06T18:29:00.400",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Technical Description",
        "Third Party Advisory"
      ],
      "url": "https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://usn.ubuntu.com/4030-1/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://usn.ubuntu.com/4030-1/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2016-3957 (GCVE-0-2016-3957)

Vulnerability from cvelistv5 – Published: 2018-02-06 18:00 – Updated: 2024-08-06 00:10

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

3 references

URL	Tags
https://devco.re/blog/2017/01/03/web2py-unseriali…	x_refsource_MISC
https://github.com/web2py/web2py/blob/R-2.14.1/gl…	x_refsource_MISC
https://usn.ubuntu.com/4030-1/	vendor-advisoryx_refsource_UBUNTU

Date Public

2016-03-25 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.