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"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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.
Loading…
Loading…