Vulnerability-Lookup

CVE-2023-45811 (GCVE-0-2023-45811)

Vulnerability from cvelistv5 – Published: 2023-10-17 22:37 – Updated: 2024-09-13 15:29

Title

Prototype pollution vulnerability leading to arbitrary code execution in synchrony deobfuscator

Summary

Synchrony deobfuscator is a javascript cleaner & deobfuscator. A `__proto__` pollution vulnerability exists in versions before v2.4.4. Successful exploitation could lead to arbitrary code execution. A `__proto__` pollution vulnerability exists in the `LiteralMap` transformer allowing crafted input to modify properties in the Object prototype. A fix has been released in `deobfuscator@2.4.4`. Users are advised to upgrade. Users unable to upgrade should launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flags

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-13 15:26 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/relative/synchrony/security/ad…	x_refsource_CONFIRM
https://github.com/relative/synchrony/commit/b583…	x_refsource_MISC
https://github.com/relative/synchrony/security/ad…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
relative	synchrony	Affected: >= 2.0.1, < 2.4.4	guessed
relative	synchrony	Affected: 2.0.1 , < 2.4.4 (custom) cpe:2.3:a:relative:synchrony::::::nodejs::*

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JSON

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FKIE_CVE-2023-45811

Vulnerability from fkie_nvd - Published: 2023-10-17 23:15 - Updated: 2026-06-17 06:29

Severity

8.1 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40	Patch
security-advisories@github.com	https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx	Exploit, Vendor Advisory
security-advisories@github.com	https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts	Broken Link
af854a3a-2127-422b-91ae-364da2661108	https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40	Patch
af854a3a-2127-422b-91ae-364da2661108	https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx	Exploit, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts	Broken Link

Impacted products

	Vendor	Product	Version
	relative	synchrony	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "synchrony",
          "vendor": "relative",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.1, \u003c 2.4.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:relative:synchrony:*:*:*:*:*:nodejs:*:*"
          ],
          "defaultStatus": "unknown",
          "product": "synchrony",
          "vendor": "relative",
          "versions": [
            {
              "lessThan": "2.4.4",
              "status": "affected",
              "version": "2.0.1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:relative:synchrony:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "49B74BDF-C6AA-4C0C-9FA2-FD31C323BD2F",
              "versionEndExcluding": "2.4.4",
              "versionStartIncluding": "2.0.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Synchrony deobfuscator is a javascript cleaner \u0026 deobfuscator.  A `__proto__` pollution vulnerability exists in versions before v2.4.4. Successful exploitation could lead to arbitrary code execution. A `__proto__` pollution vulnerability exists in the `LiteralMap` transformer allowing crafted input to modify properties in the Object prototype. A fix has been released in `deobfuscator@2.4.4`. Users are advised to upgrade. Users unable to upgrade should launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flags\n"
    },
    {
      "lang": "es",
      "value": "Synchrony deofuscator es un limpiador y desofuscador de JavaScript. Existe una vulnerabilidad de contaminaci\u00f3n `__proto__` en versiones anteriores a la v2.4.4. Una explotaci\u00f3n exitosa podr\u00eda conducir a la ejecuci\u00f3n de c\u00f3digo arbitrario. Existe una vulnerabilidad de contaminaci\u00f3n `__proto__` en el transformador `LiteralMap` que permite que una entrada manipulada modifique las propiedades en el prototipo del objeto. Se ha publicado una soluci\u00f3n en `deobfuscator@2.4.4`. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar deben iniciar el nodo con los indicadores [--disable-proto=delete][disable-proto] o [--disable-proto=throw][disable-proto]"
    }
  ],
  "id": "CVE-2023-45811",
  "lastModified": "2026-06-17T06:29:34.340",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.4,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-45811",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-13T15:26:06.582156Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-10-17T23:15:12.487",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Broken Link"
      ],
      "url": "https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Broken Link"
      ],
      "url": "https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1321"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1321"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-JG82-XH3W-RHXX

Vulnerability from github – Published: 2023-10-18 18:27 – Updated: 2025-07-22 15:37

Summary

Synchrony deobfuscator prototype pollution vulnerability leading to arbitrary code execution

Details

Impact

A __proto__ pollution vulnerability exists in synchrony versions before v2.4.4. Successful exploitation could lead to arbitrary code execution.

Summary

A __proto__ pollution vulnerability exists in the LiteralMap transformer allowing crafted input to modify properties in the Object prototype.

When executing in Node.js, due to use of the prettier module, defining a parser property on __proto__ with a path to a JS module on disk causes a require of the value which can lead to arbitrary code execution.

Patch

A fix has been released in deobfuscator@2.4.4.

Mitigation

Upgrade synchrony to v2.4.4
Launch node with the --disable-proto=delete or --disable-proto=throw flag

Proof of Concept

Craft a malicious input file named poc.js as follows:

// Malicious code to be run after this file is imported. Logs the result of shell command "dir" to the console.
console.log(require('child_process').execSync('dir').toString())

// Synchrony exploit PoC
{
  var __proto__ = { parser: 'poc.js' }
}

Then, run synchrony poc.js from the same directory as the malicious file.

Credits

This vulnerability was found and disclosed by William Khem-Marquez.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "deobfuscator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.1"
            },
            {
              "fixed": "2.4.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-45811"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-10-18T18:27:13Z",
    "nvd_published_at": "2023-10-17T23:15:12Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA `__proto__` pollution vulnerability exists in synchrony versions before v2.4.4. Successful exploitation could lead to arbitrary code execution.\n\n### Summary\n\nA `__proto__` pollution vulnerability exists in the [LiteralMap] transformer allowing crafted input to modify properties in the Object prototype.\n\nWhen executing in Node.js, due to use of the `prettier` module, defining a `parser` property on `__proto__` with a path to a JS module on disk [causes a `require` of the value][prettier/src/main/parser.js] which can lead to arbitrary code execution.\n\n### Patch\n\nA fix has been released in `deobfuscator@2.4.4`.\n\n### Mitigation\n\n- Upgrade synchrony to v2.4.4\n- Launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flag\n\n### Proof of Concept\n\nCraft a malicious input file named `poc.js` as follows:\n\n```js\n// Malicious code to be run after this file is imported. Logs the result of shell command \"dir\" to the console.\nconsole.log(require(\u0027child_process\u0027).execSync(\u0027dir\u0027).toString())\n\n// Synchrony exploit PoC\n{\n  var __proto__ = { parser: \u0027poc.js\u0027 }\n}\n```\n\nThen, run `synchrony poc.js` from the same directory as the malicious file.\n\n### Credits\n\nThis vulnerability was found and disclosed by [William Khem-Marquez][SteakEnthusiast].\n\n[LiteralMap]: src/transformers/literalmap.ts\n[SteakEnthusiast]: https://github.com/SteakEnthusiast\n[disable-proto]: https://nodejs.dev/en/api/v20/cli/#--disable-protomode\n[prettier/src/main/parser.js]: https://github.com/prettier/prettier/blob/2.5.1/src/main/parser.js#L53-L63",
  "id": "GHSA-jg82-xh3w-rhxx",
  "modified": "2025-07-22T15:37:30Z",
  "published": "2023-10-18T18:27:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-45811"
    },
    {
      "type": "WEB",
      "url": "https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/relative/synchrony"
    },
    {
      "type": "WEB",
      "url": "https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Synchrony deobfuscator prototype pollution vulnerability leading to arbitrary code execution"
}

GSD-2023-45811

Vulnerability from gsd - Updated: 2023-12-13 01:20

Details

Aliases

CVE-2023-45811

Aliases

CVE-2023-45811

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2023-45811",
    "id": "GSD-2023-45811"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-45811"
      ],
      "details": "Synchrony deobfuscator is a javascript cleaner \u0026 deobfuscator.  A `__proto__` pollution vulnerability exists in versions before v2.4.4. Successful exploitation could lead to arbitrary code execution. A `__proto__` pollution vulnerability exists in the `LiteralMap` transformer allowing crafted input to modify properties in the Object prototype. A fix has been released in `deobfuscator@2.4.4`. Users are advised to upgrade. Users unable to upgrade should launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flags\n",
      "id": "GSD-2023-45811",
      "modified": "2023-12-13T01:20:38.234301Z",
      "schema_version": "1.4.0"
    }
  },
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              "product": {
                "product_data": [
                  {
                    "product_name": "synchrony",
                    "version": {
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                        {
                          "version_affected": "=",
                          "version_value": "\u003e= 2.0.1, \u003c 2.4.4"
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      "references": {
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          }
        ]
      },
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    "nvd.nist.gov": {
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        "description": {
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              "value": "Synchrony deobfuscator is a javascript cleaner \u0026 deobfuscator.  A `__proto__` pollution vulnerability exists in versions before v2.4.4. Successful exploitation could lead to arbitrary code execution. A `__proto__` pollution vulnerability exists in the `LiteralMap` transformer allowing crafted input to modify properties in the Object prototype. A fix has been released in `deobfuscator@2.4.4`. Users are advised to upgrade. Users unable to upgrade should launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flags\n"
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            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2023-10-25T13:33Z",
      "publishedDate": "2023-10-17T23:15Z"
    }
  }
}

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.

Action not permitted

CVE-2023-45811 (GCVE-0-2023-45811)

FKIE_CVE-2023-45811

GHSA-JG82-XH3W-RHXX

Impact

Summary

Patch

Mitigation

Proof of Concept

Credits

GSD-2023-45811

Tags

Sightings

Nomenclature

Related by attack behaviour