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{"bugzilla": {"description": "kernel: path traversal in fs/nfsd/nfs3xdr.c may lead to Information Disclosure or RCE", "id": "1918179", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1918179"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.7", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-22", "details": ["fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior", "A flaw leak of the file handle for parent directory in the Linux kernel's NFS3 functionality was found in the way user calls READDIRPLUS. A local user could use this flaw to traverse to other parts of the file-system than mounted sub-folder."], "mitigation": {"lang": "en:us", "value": "When export subdirectory of a filesystem, enable subtree_check option of the NFS server for preventing possibility of accessing outside of this export."}, "name": "CVE-2021-3178", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-01-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-3178\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-3178"], "statement": "This flaw is rated as having Moderate impact because of the attack limitation: the user can gain more access than expected only inside NFS root mount point if already have permissions for the access to this NFS sub-folder.\nAlso this is a known limitation of NFSv3 and there is a known and documented configuration option to avoid this. As such, this is more of an hardening rather than security issue.", "threat_severity": "Moderate"}