gsd-2020-8159
Vulnerability from gsd
Modified
2020-05-06 00:00
Details
There is a vulnerability in the actionpack-page_caching gem that allows an attacker
to write arbitrary files to a web server, potentially resulting in remote code execution
if the attacker can write unescaped ERB to a view.
Versions Affected: All versions of actionpack-page_caching (part of Rails prior to Rails 4.0)
Not affected: Applications not using actionpack-page_caching
Fixed Versions: actionpack-page_caching >= 1.2.1
Impact
------
The Action Pack Page Caching gem writes cache files to the file system in
order for the front end webserver (nginx, Apache, etc) to serve the cached
file without making a request to the application server. Paths contain what
is effectively user input can be used to manipulate the location of the cache
file.
For example "/users/123" could be changed to "/users/../../../foo" and this
will escape the cache directory. Attackers can use this technique to
springboard to an RCE if they can write arbitrary ERb to a view folder.
Impacted code looks like this:
```
class BooksController < ApplicationController
caches_page :show
end
```
Where the `show` action of the `BooksController` may be vulnerable.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-8159",
"description": "There is a vulnerability in actionpack_page-caching gem \u003c v1.2.1 that allows an attacker to write arbitrary files to a web server, potentially resulting in remote code execution if the attacker can write unescaped ERB to a view.",
"id": "GSD-2020-8159"
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
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"affected": [
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"package": {
"ecosystem": "RubyGems",
"name": "actionpack-page_caching",
"purl": "pkg:gem/actionpack-page_caching"
}
}
],
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"details": "There is a vulnerability in the actionpack-page_caching gem that allows an attacker\nto write arbitrary files to a web server, potentially resulting in remote code execution\nif the attacker can write unescaped ERB to a view.\n\nVersions Affected: All versions of actionpack-page_caching (part of Rails prior to Rails 4.0)\nNot affected: Applications not using actionpack-page_caching\nFixed Versions: actionpack-page_caching \u003e= 1.2.1\n\nImpact\n------\n\nThe Action Pack Page Caching gem writes cache files to the file system in\norder for the front end webserver (nginx, Apache, etc) to serve the cached\nfile without making a request to the application server. Paths contain what\nis effectively user input can be used to manipulate the location of the cache\nfile.\n\nFor example \"/users/123\" could be changed to \"/users/../../../foo\" and this\nwill escape the cache directory. Attackers can use this technique to\nspringboard to an RCE if they can write arbitrary ERb to a view folder.\n\nImpacted code looks like this:\n\n```\nclass BooksController \u003c ApplicationController\n caches_page :show\nend\n```\n\nWhere the `show` action of the `BooksController` may be vulnerable.\n",
"id": "GSD-2020-8159",
"modified": "2020-05-06T00:00:00.000Z",
"published": "2020-05-06T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://groups.google.com/forum/#!topic/rubyonrails-security/CFRVkEytdP8"
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"description": "There is a vulnerability in the actionpack-page_caching gem that allows an attacker\nto write arbitrary files to a web server, potentially resulting in remote code execution\nif the attacker can write unescaped ERB to a view.\n\nVersions Affected: All versions of actionpack-page_caching (part of Rails prior to Rails 4.0)\nNot affected: Applications not using actionpack-page_caching\nFixed Versions: actionpack-page_caching \u003e= 1.2.1\n\nImpact\n------\n\nThe Action Pack Page Caching gem writes cache files to the file system in\norder for the front end webserver (nginx, Apache, etc) to serve the cached\nfile without making a request to the application server. Paths contain what\nis effectively user input can be used to manipulate the location of the cache\nfile.\n\nFor example \"/users/123\" could be changed to \"/users/../../../foo\" and this\nwill escape the cache directory. Attackers can use this technique to\nspringboard to an RCE if they can write arbitrary ERb to a view folder.\n\nImpacted code looks like this:\n\n```\nclass BooksController \u003c ApplicationController\n caches_page :show\nend\n```\n\nWhere the `show` action of the `BooksController` may be vulnerable.\n",
"gem": "actionpack-page_caching",
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"package_slug": "gem/actionpack-page_caching",
"pubdate": "2020-05-12",
"solution": "Upgrade to version 1.2.1 or above.",
"title": "Path Traversal",
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],
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"vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
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"lastModifiedDate": "2022-04-05T15:02Z",
"publishedDate": "2020-05-12T13:15Z"
}
}
}
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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.
- 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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