GSD-2020-8159
Vulnerability from gsd - Updated: 2020-05-06 00:00Details
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
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"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": {
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"remediation": "unknown",
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"type": "vulnerability"
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"name": "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": [
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"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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"pubdate": "2020-05-12",
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"title": "Path Traversal",
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"lastModifiedDate": "2022-04-05T15:02Z",
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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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