gsd-2021-28957
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Aliases
Aliases
{ "GSD": { "alias": "CVE-2021-28957", "description": "An XSS vulnerability was discovered in python-lxml\u0027s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.", "id": "GSD-2021-28957", "references": [ "https://www.suse.com/security/cve/CVE-2021-28957.html", "https://www.debian.org/security/2021/dsa-4880", "https://access.redhat.com/errata/RHSA-2021:4162", "https://access.redhat.com/errata/RHSA-2021:4160", "https://access.redhat.com/errata/RHSA-2021:4158", "https://access.redhat.com/errata/RHSA-2021:4151", "https://access.redhat.com/errata/RHSA-2021:3254", "https://ubuntu.com/security/CVE-2021-28957", "https://advisories.mageia.org/CVE-2021-28957.html", "https://security.archlinux.org/CVE-2021-28957", "https://linux.oracle.com/cve/CVE-2021-28957.html" ] }, "gsd": { "metadata": { "exploitCode": "unknown", "remediation": "unknown", "reportConfidence": "confirmed", "type": "vulnerability" }, "osvSchema": { "aliases": [ "CVE-2021-28957" ], "details": "An XSS vulnerability was discovered in python-lxml\u0027s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.", "id": "GSD-2021-28957", "modified": "2023-12-13T01:23:29.440267Z", "schema_version": "1.4.0" } }, "namespaces": { "cve.org": { "CVE_data_meta": { "ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-28957", "STATE": "PUBLIC" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "n/a", "version": { "version_data": [ { "version_value": "n/a" } ] } } ] }, "vendor_name": "n/a" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "An XSS vulnerability was discovered in python-lxml\u0027s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "references": { "reference_data": [ { "name": "https://bugs.launchpad.net/lxml/+bug/1888153", "refsource": "MISC", "url": "https://bugs.launchpad.net/lxml/+bug/1888153" }, { "name": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270", "refsource": "MISC", "url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270" }, { "name": "[debian-lts-announce] 20210324 [SECURITY] [DLA 2606-1] lxml security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html" }, { "name": "DSA-4880", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4880" }, { "name": "FEDORA-2021-28723f9670", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45/" }, { "name": "FEDORA-2021-4cdb0f68c7", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ/" }, { "name": "https://www.oracle.com/security-alerts/cpuoct2021.html", "refsource": "MISC", "url": "https://www.oracle.com/security-alerts/cpuoct2021.html" }, { "name": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999", "refsource": "MISC", "url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999" }, { "name": "https://security.netapp.com/advisory/ntap-20210521-0004/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20210521-0004/" }, { "name": "GLSA-202208-06", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202208-06" } ] } }, "gitlab.com": { "advisories": [ { "affected_range": "\u003c4.6.3", "affected_versions": "All versions before 4.6.3", "cvss_v2": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "cwe_ids": [ "CWE-1035", "CWE-79", "CWE-937" ], "date": "2022-12-09", "description": "lxml allows XSS. It places the HTML action attribute into `defs.link_attrs` (in `html/defs.py`) for later use in input sanitization, but does not do the same for the HTML5 formaction attribute.", "fixed_versions": [ "4.6.3" ], "identifier": "CVE-2021-28957", "identifiers": [ "CVE-2021-28957" ], "not_impacted": "All versions starting from 4.6.3", "package_slug": "pypi/lxml", "pubdate": "2021-03-21", "solution": "Upgrade to version 4.6.3 or above.", "title": "Cross-site Scripting", "urls": [ "https://nvd.nist.gov/vuln/detail/CVE-2021-28957", "https://bugs.launchpad.net/lxml/+bug/1888153" ], "uuid": "63aefd8d-fb3d-4553-be5c-4a0498ee1c6a" } ] }, "nvd.nist.gov": { "configurations": { "CVE_data_version": "4.0", "nodes": [ { "children": [], "cpe_match": [ { "cpe23Uri": "cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:*", "cpe_name": [], "versionEndExcluding": "4.6.3", "vulnerable": true } ], "operator": "OR" }, { "children": [], "cpe_match": [ { "cpe23Uri": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true }, { "cpe23Uri": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true } ], "operator": "OR" }, { "children": [], "cpe_match": [ { "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true }, { "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true } ], "operator": "OR" }, { "children": [], "cpe_match": [ { "cpe23Uri": "cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true } ], "operator": "OR" }, { "children": [], "cpe_match": [ { "cpe23Uri": "cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true } ], "operator": "OR" } ] }, "cve": { "CVE_data_meta": { "ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-28957" }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "en", "value": "An XSS vulnerability was discovered in python-lxml\u0027s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "en", "value": "CWE-79" } ] } ] }, "references": { "reference_data": [ { "name": "https://bugs.launchpad.net/lxml/+bug/1888153", "refsource": "MISC", "tags": [ "Exploit", "Issue Tracking", "Third Party Advisory" ], "url": "https://bugs.launchpad.net/lxml/+bug/1888153" }, { "name": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270", "refsource": "MISC", "tags": [ "Patch", "Third Party Advisory" ], "url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270" }, { "name": "[debian-lts-announce] 20210324 [SECURITY] [DLA 2606-1] lxml security update", "refsource": "MLIST", "tags": [ "Mailing List", "Third Party Advisory" ], "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html" }, { "name": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999", "refsource": "MISC", "tags": [ "Patch", "Third Party Advisory" ], "url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999" }, { "name": "DSA-4880", "refsource": "DEBIAN", "tags": [ "Third Party Advisory" ], "url": "https://www.debian.org/security/2021/dsa-4880" }, { "name": "https://security.netapp.com/advisory/ntap-20210521-0004/", "refsource": "CONFIRM", "tags": [ "Third Party Advisory" ], "url": "https://security.netapp.com/advisory/ntap-20210521-0004/" }, { "name": "FEDORA-2021-28723f9670", "refsource": "FEDORA", "tags": [ "Mailing List", "Third Party Advisory" ], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45/" }, { "name": "FEDORA-2021-4cdb0f68c7", "refsource": "FEDORA", "tags": [ "Mailing List", "Third Party Advisory" ], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ/" }, { "name": "https://www.oracle.com/security-alerts/cpuoct2021.html", "refsource": "MISC", "tags": [ "Patch", "Third Party Advisory" ], "url": "https://www.oracle.com/security-alerts/cpuoct2021.html" }, { "name": "GLSA-202208-06", "refsource": "GENTOO", "tags": [ "Third Party Advisory" ], "url": "https://security.gentoo.org/glsa/202208-06" } ] } }, "impact": { "baseMetricV2": { "acInsufInfo": false, "cvssV2": { "accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0" }, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "severity": "MEDIUM", "userInteractionRequired": true }, "baseMetricV3": { "cvssV3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1" }, "exploitabilityScore": 2.8, "impactScore": 2.7 } }, "lastModifiedDate": "2022-12-09T18:15Z", "publishedDate": "2021-03-21T05:15Z" } } }
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- 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.