gsd-2021-43776
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-43776",
"description": "Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user\u0027s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.",
"id": "GSD-2021-43776"
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-43776"
],
"details": "Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user\u0027s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.",
"id": "GSD-2021-43776",
"modified": "2023-12-13T01:23:26.143830Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
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"CVE_data_meta": {
"ASSIGNER": "security-advisories@github.com",
"ID": "CVE-2021-43776",
"STATE": "PUBLIC",
"TITLE": "XSS vulnerability in @backstage/plugin-auth-backend"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "backstage",
"version": {
"version_data": [
{
"version_value": "\u003c 0.4.9"
}
]
}
}
]
},
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}
]
}
},
"data_format": "MITRE",
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"data_version": "4.0",
"description": {
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"value": "Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user\u0027s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`."
}
]
},
"impact": {
"cvss": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
"version": "3.1"
}
},
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"description": [
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"lang": "eng",
"value": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
}
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}
]
},
"references": {
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"refsource": "CONFIRM",
"url": "https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49"
},
{
"name": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend",
"refsource": "MISC",
"url": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend"
}
]
},
"source": {
"advisory": "GHSA-w7fj-336r-vw49",
"discovery": "UNKNOWN"
}
},
"gitlab.com": {
"advisories": [
{
"affected_range": "\u003c0.4.9",
"affected_versions": "All versions before 0.4.9",
"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-79",
"CWE-937"
],
"date": "2021-12-01",
"description": "Backstage is an open platform for building developer portals.This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user\u0027s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.",
"fixed_versions": [
"0.4.9"
],
"identifier": "CVE-2021-43776",
"identifiers": [
"GHSA-w7fj-336r-vw49",
"CVE-2021-43776"
],
"not_impacted": "All versions starting from 0.4.9",
"package_slug": "npm/@backstage/plugin-auth-backend",
"pubdate": "2021-12-01",
"solution": "Upgrade to version 0.4.9 or above.",
"title": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"urls": [
"https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49",
"https://nvd.nist.gov/vuln/detail/CVE-2021-43776",
"https://github.com/backstage/backstage/tree/master/plugins/auth-backend",
"https://github.com/advisories/GHSA-w7fj-336r-vw49"
],
"uuid": "105fda96-9465-47e3-94a8-c67da5ac0233"
}
]
},
"nvd.nist.gov": {
"configurations": {
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"nodes": [
{
"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:a:linuxfoundation:auth_backend:*:*:*:*:*:node.js:*:*",
"cpe_name": [],
"versionEndExcluding": "0.4.9",
"vulnerable": true
}
],
"operator": "OR"
}
]
},
"cve": {
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"ID": "CVE-2021-43776"
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "en",
"value": "Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user\u0027s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "en",
"value": "CWE-79"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49",
"refsource": "CONFIRM",
"tags": [
"Third Party Advisory"
],
"url": "https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49"
},
{
"name": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend",
"refsource": "MISC",
"tags": [
"Product",
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],
"url": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend"
}
]
}
},
"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": "2021-11-30T19:11Z",
"publishedDate": "2021-11-26T19:15Z"
}
}
}
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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.