GSD-2020-5217
Vulnerability from gsd - Updated: 2020-01-23 00:00Details
If user-supplied input was passed into append/override_content_security_policy_directives,
a semicolon could be injected leading to directive injection.
This could be used to e.g. override a script-src directive. Duplicate directives are ignored
and the first one wins. The directives in secure_headers are sorted alphabetically so they
pretty much all come before script-src. A previously undefined directive would receive a value
even if SecureHeaders::OPT_OUT was supplied.
The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning
when this happens. This will result in innocuous browser console messages if being
exploited/accidentally used. In future releases, we will raise application errors resulting in
500s.
> Duplicate script-src directives detected. All but the first instance will be ignored.
See https://www.w3.org/TR/CSP3/#parse-serialized-policy
> Note: In this case, the user agent SHOULD notify developers that a duplicate directive was
> ignored. A console warning might be appropriate, for example.
# Workarounds
If you are passing user input into the above methods, you could filter out the input:
```
override_content_security_policy_directives(:frame_src, [user_input.gsub(";", " ")])
```
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-5217",
"description": "In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could be used to e.g. override a script-src directive. Duplicate directives are ignored and the first one wins. The directives in secure_headers are sorted alphabetically so they pretty much all come before script-src. A previously undefined directive would receive a value even if SecureHeaders::OPT_OUT was supplied. The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s. Depending on what major version you are using, the fixed versions are 6.2.0, 5.1.0, 3.8.0.",
"id": "GSD-2020-5217",
"references": [
"https://access.redhat.com/errata/RHSA-2020:4366"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "secure_headers",
"purl": "pkg:gem/secure_headers"
}
}
],
"aliases": [
"CVE-2020-5217",
"GHSA-xq52-rv6w-397c"
],
"details": "If user-supplied input was passed into append/override_content_security_policy_directives,\na semicolon could be injected leading to directive injection.\n\nThis could be used to e.g. override a script-src directive. Duplicate directives are ignored\nand the first one wins. The directives in secure_headers are sorted alphabetically so they\npretty much all come before script-src. A previously undefined directive would receive a value\neven if SecureHeaders::OPT_OUT was supplied.\n\nThe fixed versions will silently convert the semicolons to spaces and emit a deprecation warning\nwhen this happens. This will result in innocuous browser console messages if being\nexploited/accidentally used. In future releases, we will raise application errors resulting in\n500s.\n\n\u003e Duplicate script-src directives detected. All but the first instance will be ignored.\n\nSee https://www.w3.org/TR/CSP3/#parse-serialized-policy\n\n\u003e Note: In this case, the user agent SHOULD notify developers that a duplicate directive was\n\u003e ignored. A console warning might be appropriate, for example.\n\n# Workarounds\n\nIf you are passing user input into the above methods, you could filter out the input:\n\n```\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\";\", \" \")])\n```",
"id": "GSD-2020-5217",
"modified": "2020-01-23T00:00:00.000Z",
"published": "2020-01-23T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": 4.4,
"type": "CVSS_V3"
}
],
"summary": "secure_headers directive injection using semicolon"
}
},
"namespaces": {
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"TITLE": "Directive injection when using dynamic overrides with user input in RubyGems secure_headers"
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"affects": {
"vendor": {
"vendor_data": [
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"version": {
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{
"version_value": "\u003c 3.8.0"
},
{
"version_value": "\u003e= 5.0.0, \u003c 5.1.0"
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"value": "In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could be used to e.g. override a script-src directive. Duplicate directives are ignored and the first one wins. The directives in secure_headers are sorted alphabetically so they pretty much all come before script-src. A previously undefined directive would receive a value even if SecureHeaders::OPT_OUT was supplied. The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s. Depending on what major version you are using, the fixed versions are 6.2.0, 5.1.0, 3.8.0."
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"impact": {
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code (\u0027Eval Injection\u0027)"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c",
"refsource": "CONFIRM",
"url": "https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c"
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{
"name": "https://github.com/twitter/secure_headers/issues/418",
"refsource": "MISC",
"url": "https://github.com/twitter/secure_headers/issues/418"
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"name": "https://github.com/twitter/secure_headers/pull/421",
"refsource": "MISC",
"url": "https://github.com/twitter/secure_headers/pull/421"
},
{
"name": "https://github.com/twitter/secure_headers/commit/936a160e3e9659737a9f9eafce13eea36b5c9fa3",
"refsource": "MISC",
"url": "https://github.com/twitter/secure_headers/commit/936a160e3e9659737a9f9eafce13eea36b5c9fa3"
}
]
},
"source": {
"advisory": "GHSA-xq52-rv6w-397c",
"discovery": "UNKNOWN"
}
},
"github.com/rubysec/ruby-advisory-db": {
"cve": "2020-5217",
"cvss_v3": 4.4,
"date": "2020-01-23",
"description": "If user-supplied input was passed into append/override_content_security_policy_directives,\na semicolon could be injected leading to directive injection.\n\nThis could be used to e.g. override a script-src directive. Duplicate directives are ignored\nand the first one wins. The directives in secure_headers are sorted alphabetically so they\npretty much all come before script-src. A previously undefined directive would receive a value\neven if SecureHeaders::OPT_OUT was supplied.\n\nThe fixed versions will silently convert the semicolons to spaces and emit a deprecation warning\nwhen this happens. This will result in innocuous browser console messages if being\nexploited/accidentally used. In future releases, we will raise application errors resulting in\n500s.\n\n\u003e Duplicate script-src directives detected. All but the first instance will be ignored.\n\nSee https://www.w3.org/TR/CSP3/#parse-serialized-policy\n\n\u003e Note: In this case, the user agent SHOULD notify developers that a duplicate directive was\n\u003e ignored. A console warning might be appropriate, for example.\n\n# Workarounds\n\nIf you are passing user input into the above methods, you could filter out the input:\n\n```\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\";\", \" \")])\n```",
"gem": "secure_headers",
"ghsa": "xq52-rv6w-397c",
"patched_versions": [
"~\u003e 3.8",
"~\u003e 5.1",
"\u003e= 6.2.0"
],
"title": "secure_headers directive injection using semicolon",
"url": "https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c"
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"gitlab.com": {
"advisories": [
{
"affected_range": "\u003c3.8.0||\u003e=5.0.0 \u003c5.1.0||\u003e=6.0.0 \u003c6.2.0",
"affected_versions": "All versions before 3.8.0, all versions starting from 5.0.0 before 5.1.0, all versions starting from 6.0.0 before 6.2.0",
"cvss_v2": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-74",
"CWE-937"
],
"date": "2020-05-21",
"description": "The secure_headers gem is vulnerable to a directive injection vulnerability.",
"fixed_versions": [
"3.8.0",
"5.1.0",
"6.2.0"
],
"identifier": "CVE-2020-5217",
"identifiers": [
"CVE-2020-5217",
"GHSA-xq52-rv6w-397c"
],
"not_impacted": "All versions starting from 3.8.0 before 5.0.0, all versions starting from 5.1.0 before 6.0.0, all versions starting from 6.2.0",
"package_slug": "gem/secure_headers",
"pubdate": "2020-01-23",
"solution": "Upgrade to versions 3.8.0, 5.1.0, 6.2.0 or above.",
"title": "Injection Vulnerability",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-5217"
],
"uuid": "3a9043b9-524b-47b3-b9a6-28c9d167d72c"
}
]
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"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
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"obtainOtherPrivilege": false,
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"severity": "MEDIUM",
"userInteractionRequired": false
},
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4
}
},
"lastModifiedDate": "2020-05-21T13:51Z",
"publishedDate": "2020-01-23T03:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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