gsd-2020-8162
Vulnerability from gsd
Modified
2020-05-18 00:00
Details
There is a vulnerability in ActiveStorage's S3 adapter that allows the Content-Length of a
direct file upload to be modified by an end user.
Versions Affected: rails < 5.2.4.2, rails < 6.0.3.1
Not affected: Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter.
Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1
Impact
------
Utilizing this vulnerability, an attacker can control the Content-Length of an S3 direct upload URL without receiving a
new signature from the server. This could be used to bypass controls in place on the server to limit upload size.
Workarounds
-----------
This is a low-severity security issue. As such, no workaround is necessarily
until such time as the application can be upgraded.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-8162",
"description": "A client side enforcement of server side security vulnerability exists in rails \u003c 5.2.4.2 and rails \u003c 6.0.3.1 ActiveStorage\u0027s S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user bypassing upload limits.",
"id": "GSD-2020-8162",
"references": [
"https://www.suse.com/security/cve/CVE-2020-8162.html",
"https://www.debian.org/security/2020/dsa-4766",
"https://access.redhat.com/errata/RHSA-2021:1313"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "activestorage",
"purl": "pkg:gem/activestorage"
}
}
],
"aliases": [
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"GHSA-m42x-37p3-fv5w"
],
"details": "There is a vulnerability in ActiveStorage\u0027s S3 adapter that allows the Content-Length of a\ndirect file upload to be modified by an end user.\n\nVersions Affected: rails \u003c 5.2.4.2, rails \u003c 6.0.3.1\nNot affected: Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter.\nFixed Versions: rails \u003e= 5.2.4.3, rails \u003e= 6.0.3.1\n\nImpact\n------\n\nUtilizing this vulnerability, an attacker can control the Content-Length of an S3 direct upload URL without receiving a\nnew signature from the server. This could be used to bypass controls in place on the server to limit upload size.\n\nWorkarounds\n-----------\n\nThis is a low-severity security issue. As such, no workaround is necessarily\nuntil such time as the application can be upgraded.\n",
"id": "GSD-2020-8162",
"modified": "2020-05-18T00:00:00.000Z",
"published": "2020-05-18T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://groups.google.com/forum/#!topic/rubyonrails-security/PjU3946mreQ"
}
],
"schema_version": "1.4.0",
"severity": [
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"score": 7.5,
"type": "CVSS_V3"
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"summary": "Circumvention of file size limits in ActiveStorage"
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"description": "There is a vulnerability in ActiveStorage\u0027s S3 adapter that allows the Content-Length of a\ndirect file upload to be modified by an end user.\n\nVersions Affected: rails \u003c 5.2.4.2, rails \u003c 6.0.3.1\nNot affected: Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter.\nFixed Versions: rails \u003e= 5.2.4.3, rails \u003e= 6.0.3.1\n\nImpact\n------\n\nUtilizing this vulnerability, an attacker can control the Content-Length of an S3 direct upload URL without receiving a\nnew signature from the server. This could be used to bypass controls in place on the server to limit upload size.\n\nWorkarounds\n-----------\n\nThis is a low-severity security issue. As such, no workaround is necessarily\nuntil such time as the application can be upgraded.\n",
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"title": "Circumvention of file size limits in ActiveStorage",
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"package_slug": "gem/activestorage",
"pubdate": "2020-06-19",
"solution": "Upgrade to versions 5.2.4.2, 6.0.3.1 or above.",
"title": "Unrestricted Upload of File with Dangerous Type",
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"solution": "Upgrade to versions 5.2.4.2, 6.0.3.1 or above.",
"title": "Unrestricted Upload of File with Dangerous Type",
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"authentication": "NONE",
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"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
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"scope": "UNCHANGED",
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}
},
"lastModifiedDate": "2022-05-24T16:15Z",
"publishedDate": "2020-06-19T17:15Z"
}
}
}
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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.
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