gsd-2021-4034
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.
Aliases
Aliases
{ "GSD": { "affected_component": "pkexec", "alias": "CVE-2021-4034", "attack_vector": "local", "credit": "", "description": "To quote the Qualys Research Team: has discovered a memory corruption vulnerability in polkit\u2019s pkexec, a SUID-root program that is installed by default on every major Linux distribution. This easily exploited vulnerability allows any unprivileged user to gain full root privileges on a vulnerable host by exploiting this vulnerability in its default configuration.\n\n# Workaround\n\nchmod 0755 /usr/bin/pkexec", "extended_references": [ { "note": "introduced", "type": "commit", "value": "c8c3d835d24fc4ce5a9c596c7d55d85a0311e8d1" }, { "note": "fixed", "type": "commit", "value": "a2bf5c9c83b6ae46cbd5c779d3055bff81ded683" } ], "id": "GSD-2021-4034", "impact": "local code execution as root", "notes": "", "product_name": "Polkit", "product_version": "all versions prior to commit a2bf5c9c83b6ae46cbd5c779d3055bff81ded683", "references": [ "https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034", "https://gitlab.freedesktop.org/polkit/polkit/-/commit/c8c3d835d24fc4ce5a9c596c7d55d85a0311e8d1", "https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683", "https://ryiron.wordpress.com/2013/12/16/argv-silliness/", "https://pythonrepo.com/repo/joeammond-CVE-2021-4034", "https://github.com/berdav/CVE-2021-4034", "https://github.com/arthepsy/CVE-2021-4034", "https://github.com/joeammond/CVE-2021-4034", "https://packetstormsecurity.com/files/165728/cve-2021-4043-poc.c", "https://security-tracker.debian.org/tracker/CVE-2021-4034", "https://access.redhat.com/security/cve/CVE-2021-4034", "https://blog.cloudlinux.com/cve-2021-4034-cloudlinux-os-7-7-hybrid-and-8-updated", "https://www.suse.com/security/cve/CVE-2021-4034.html", "https://www.debian.org/security/2022/dsa-5059", "https://access.redhat.com/errata/RHSA-2022:0540", "https://access.redhat.com/errata/RHSA-2022:0443", "https://access.redhat.com/errata/RHSA-2022:0274", "https://access.redhat.com/errata/RHSA-2022:0273", "https://access.redhat.com/errata/RHSA-2022:0272", "https://access.redhat.com/errata/RHSA-2022:0271", "https://access.redhat.com/errata/RHSA-2022:0270", "https://access.redhat.com/errata/RHSA-2022:0269", "https://access.redhat.com/errata/RHSA-2022:0268", "https://access.redhat.com/errata/RHSA-2022:0267", "https://access.redhat.com/errata/RHSA-2022:0266", "https://access.redhat.com/errata/RHSA-2022:0265", "https://ubuntu.com/security/CVE-2021-4034", "https://advisories.mageia.org/CVE-2021-4034.html", "https://security.archlinux.org/CVE-2021-4034", "https://linux.oracle.com/cve/CVE-2021-4034.html", "https://packetstormsecurity.com/files/cve/CVE-2021-4034" ], "reporter": "kurtseifried", "reporter_id": 582211, "vendor_name": "Polkit", "vulnerability_type": "unspecified" }, "gsd": { "metadata": { "exploitCode": "unknown", "remediation": "unknown", "reportConfidence": "confirmed", "type": "vulnerability" }, "osvSchema": { "aliases": [ "CVE-2021-4034" ], "details": "A local privilege escalation vulnerability was found on polkit\u0027s pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn\u0027t handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it\u0027ll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.", "id": "GSD-2021-4034", "modified": "2023-12-13T01:23:11.709043Z", "schema_version": "1.4.0" } }, "namespaces": { "cve.org": { "CVE_data_meta": { "ASSIGNER": "secalert@redhat.com", "ID": "CVE-2021-4034", "STATE": "PUBLIC" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "polkit", "version": { "version_data": [ { "version_affected": "=", "version_value": "all" } ] } } ] }, "vendor_name": "n/a" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "A local privilege escalation vulnerability was found on polkit\u0027s pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn\u0027t handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it\u0027ll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "cweId": "CWE-787", "lang": "eng", "value": "(CWE-787|CWE-125)" } ] } ] }, "references": { "reference_data": [ { "name": "https://access.redhat.com/security/vulnerabilities/RHSB-2022-001", "refsource": "MISC", "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2022-001" }, { "name": "https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt", "refsource": "MISC", "url": "https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt" }, { "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2025869", "refsource": "MISC", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2025869" }, { "name": "https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683", "refsource": "MISC", "url": "https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683" }, { "name": "https://www.oracle.com/security-alerts/cpuapr2022.html", "refsource": "MISC", "url": "https://www.oracle.com/security-alerts/cpuapr2022.html" }, { "name": "http://packetstormsecurity.com/files/166196/Polkit-pkexec-Local-Privilege-Escalation.html", "refsource": "MISC", "url": "http://packetstormsecurity.com/files/166196/Polkit-pkexec-Local-Privilege-Escalation.html" }, { "name": "http://packetstormsecurity.com/files/166200/Polkit-pkexec-Privilege-Escalation.html", "refsource": "MISC", "url": "http://packetstormsecurity.com/files/166200/Polkit-pkexec-Privilege-Escalation.html" }, { "name": "https://www.suse.com/support/kb/doc/?id=000020564", "refsource": "MISC", "url": "https://www.suse.com/support/kb/doc/?id=000020564" }, { "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-330556.pdf", "refsource": "MISC", "url": 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[], "vulnerable": true }, { "cpe23Uri": "cpe:2.3:a:starwindsoftware:command_center:1.0:update3_build5871:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true } ], "operator": "OR" } ] }, "cve": { "CVE_data_meta": { "ASSIGNER": "secalert@redhat.com", "ID": "CVE-2021-4034" }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "en", "value": "A local privilege escalation vulnerability was found on polkit\u0027s pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn\u0027t handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it\u0027ll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "en", "value": "CWE-125" }, { "lang": "en", "value": "CWE-787" } ] } ] }, "references": { "reference_data": [ { "name": "https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt", "refsource": "MISC", "tags": [ "Exploit", "Mitigation", "Third Party Advisory" ], "url": "https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt" }, { "name": "https://access.redhat.com/security/vulnerabilities/RHSB-2022-001", "refsource": "MISC", "tags": [ "Mitigation", "Vendor Advisory" ], "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2022-001" }, { "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2025869", "refsource": "MISC", "tags": [ "Issue Tracking", "Patch", "Vendor Advisory" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2025869" }, { "name": "https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683", "refsource": "MISC", "tags": [ "Patch", "Third Party Advisory" ], "url": "https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683" }, { "name": "http://packetstormsecurity.com/files/166196/Polkit-pkexec-Local-Privilege-Escalation.html", "refsource": "MISC", "tags": [ "Exploit", "Third Party Advisory", "VDB Entry" ], "url": "http://packetstormsecurity.com/files/166196/Polkit-pkexec-Local-Privilege-Escalation.html" }, { "name": "http://packetstormsecurity.com/files/166200/Polkit-pkexec-Privilege-Escalation.html", "refsource": "MISC", "tags": [ "Third Party Advisory", "VDB Entry" ], "url": "http://packetstormsecurity.com/files/166200/Polkit-pkexec-Privilege-Escalation.html" }, { "name": "https://www.suse.com/support/kb/doc/?id=000020564", "refsource": "MISC", "tags": [ "Third Party Advisory" ], "url": "https://www.suse.com/support/kb/doc/?id=000020564" }, { "name": "https://www.oracle.com/security-alerts/cpuapr2022.html", "refsource": "MISC", "tags": [ "Third Party Advisory" ], "url": "https://www.oracle.com/security-alerts/cpuapr2022.html" }, { "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-330556.pdf", "refsource": "CONFIRM", "tags": [ "Third Party Advisory" ], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-330556.pdf" }, { "name": "https://www.starwindsoftware.com/security/sw-20220818-0001/", "refsource": "MISC", "tags": [ "Third Party Advisory" ], "url": "https://www.starwindsoftware.com/security/sw-20220818-0001/" }, { "name": "https://www.secpod.com/blog/local-privilege-escalation-vulnerability-in-major-linux-distributions-cve-2021-4034/", "refsource": "MISC", "tags": [], "url": "https://www.secpod.com/blog/local-privilege-escalation-vulnerability-in-major-linux-distributions-cve-2021-4034/" } ] } }, "impact": { "baseMetricV2": { "acInsufInfo": false, "cvssV2": { "accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0" }, "exploitabilityScore": 3.9, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "severity": "HIGH", "userInteractionRequired": false }, "baseMetricV3": { "cvssV3": { "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 } }, "lastModifiedDate": "2023-10-18T01:15Z", "publishedDate": "2022-01-28T20:15Z" } } }
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.