Vulnerability-Lookup

GSD-2021-3726

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function.

Aliases

CVE-2021-3726

Aliases

CVE-2021-3726

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-3726",
    "description": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function.",
    "id": "GSD-2021-3726"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-3726"
      ],
      "details": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function.",
      "id": "GSD-2021-3726",
      "modified": "2023-12-13T01:23:34.155927Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "security@huntr.dev",
        "ID": "CVE-2021-3726",
        "STATE": "PUBLIC",
        "TITLE": "OS Command Injection in ohmyzsh/ohmyzsh"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "ohmyzsh/ohmyzsh",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_value": "a263cdac"
                        }
                      ]
                    }
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              "vendor_name": "ohmyzsh"
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      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function."
          }
        ]
      },
      "exploit": [
        {
          "lang": "eng",
          "value": "**Exploit PoC**:\n\n1. Install Oh My Zsh.\n2. Add a custom function that calls `title` to set the terminal title with a user-supplied string.\n   For example:\n\n   ```sh\n   function dirpath_in_title {\n     title \"$PWD\"\n   }\n   add-zsh-hook precmd dirpath_in_title\n   ```\n\n3. Create and cd into a directory with a subshell command as its name:\n\n   ```sh\n   baddir=\u0027`echo pwned \u0026\u0026 id`\u0027\n   mkdir \"$baddir\" \u0026\u0026 cd \"$baddir\"\n   ```\n\n4. The `title` function incorrectly expands the subshell command (see screenshot):\n\n   ![2 title_function poc](https://user-images.githubusercontent.com/1441704/142874935-341ddd3c-21e8-4b9e-a5c1-77c0b3debacc.png)"
        }
      ],
      "impact": {
        "cvss": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-78 OS Command Injection"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac",
            "refsource": "MISC",
            "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"
          }
        ]
      }
    },
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            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:planetargon:oh_my_zsh:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "2021-11-11",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
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          "ID": "CVE-2021-3726"
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        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-78"
                }
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        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "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,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2021-11-30T20:49Z",
      "publishedDate": "2021-11-30T10:15Z"
    }
  }
}

CVE-2021-3726 (GCVE-0-2021-3726)

Vulnerability from cvelistv5 – Published: 2021-11-30 09:30 – Updated: 2024-08-03 17:01

Title

OS Command Injection in ohmyzsh/ohmyzsh

Summary

Severity

7.5 (High)


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

CWE

CWE-78 - OS Command Injection

Assigner

@huntrdev CNA

CNA scorecard – unranked: 0 records in the last 180 days, 10 needed details

References

1 reference

URL	Tags
https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
ohmyzsh	ohmyzsh/ohmyzsh	Affected: unspecified , < a263cdac (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:01:08.345Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ohmyzsh/ohmyzsh",
          "vendor": "ohmyzsh",
          "versions": [
            {
              "lessThan": "a263cdac",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "**Exploit PoC**:\n\n1. Install Oh My Zsh.\n2. Add a custom function that calls `title` to set the terminal title with a user-supplied string.\n   For example:\n\n   ```sh\n   function dirpath_in_title {\n     title \"$PWD\"\n   }\n   add-zsh-hook precmd dirpath_in_title\n   ```\n\n3. Create and cd into a directory with a subshell command as its name:\n\n   ```sh\n   baddir=\u0027`echo pwned \u0026\u0026 id`\u0027\n   mkdir \"$baddir\" \u0026\u0026 cd \"$baddir\"\n   ```\n\n4. The `title` function incorrectly expands the subshell command (see screenshot):\n\n   ![2 title_function poc](https://user-images.githubusercontent.com/1441704/142874935-341ddd3c-21e8-4b9e-a5c1-77c0b3debacc.png)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-78 OS Command Injection",
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      ],
      "providerMetadata": {
        "dateUpdated": "2021-11-30T09:30:15.000Z",
        "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a",
        "shortName": "@huntrdev"
      },
      "references": [
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"
        }
      ],
      "title": "OS Command Injection in ohmyzsh/ohmyzsh",
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          "ASSIGNER": "security@huntr.dev",
          "ID": "CVE-2021-3726",
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          "TITLE": "OS Command Injection in ohmyzsh/ohmyzsh"
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          }
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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.

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.

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GSD-2021-3726

CVE-2021-3726 (GCVE-0-2021-3726)

Tags

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Nomenclature

Related by attack behaviour