nextcloud / nextcloud/files_antivirus

Regression: Infected Files Now Yield "An unknown error has occurred" Instead of Appropriate Message

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bug
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1d 6h
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Description

ℹ️ this also happens on Nextcloud 33

Steps to reproduce
  1. Install Nextcloud 15.0.5.3.
  2. Install Antivirus for Files v2.0.1.
  3. Install and configure ClamAV and the Antivirus plug-in so that it is able to communicate with ClamAV.
  4. Temporarily disable anti-virus on your local machine (to avoid it blocking your ability to test the plugin).
  5. Create an EICAR test file.
  6. Upload the test file to any file share.
Expected behaviour
  • The file should not be saved on Nextcloud.
  • The message "Infected file deleted. Eicar-Test-Signature" should appear.
Actual behaviour
  • The file is not saved on Nextcloud (as expected).
  • The message "An unknown error has occurred" appears.

This is a regression from Nextcloud 15.0.2 in which the message appeared correctly.

Server configuration

Operating system: Debian Stretch
Web server: NGinx 1.15.9
Database: MariaDB
PHP version: 7.2.15
Nextcloud version: 15.0.5.3
Updated from an older Nextcloud/ownCloud or fresh install: Fresh install
Where did you install Nextcloud from: Docker image

List of activated apps
Nextcloud apps 
Enabled:
  - accessibility: 1.1.0
  - activity: 2.8.2
  - checksum: 0.4.2
  - cloud_federation_api: 0.1.0
  - comments: 1.5.0
  - dav: 1.8.1
  - federatedfilesharing: 1.5.0
  - federation: 1.5.0
  - files: 1.10.0
  - files_antivirus: 2.0.1
  - files_downloadactivity: 1.4.0
  - files_pdfviewer: 1.4.0
  - files_sharing: 1.7.0
  - files_texteditor: 2.7.0
  - files_trashbin: 1.5.0
  - files_versions: 1.8.0
  - files_videoplayer: 1.4.0
  - firstrunwizard: 2.4.0
  - gallery: 18.2.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.3.0
  - metadata: 0.8.0
  - music: 0.9.3
  - nextcloud_announcements: 1.4.0
  - notifications: 2.3.0
  - oauth2: 1.3.0
  - ownbackup: 18.11.0
  - password_policy: 1.5.0
  - provisioning_api: 1.5.0
  - serverinfo: 1.5.0
  - sharebymail: 1.5.0
  - support: 1.0.0
  - survey_client: 1.3.0
  - systemtags: 1.5.0
  - theming: 1.6.0
  - twofactor_backupcodes: 1.4.1
  - updatenotification: 1.5.0
  - user_external: 0.5.1
  - workflowengine: 1.5.0
Disabled:
  - admin_audit
  - encryption
  - files_automatedtagging
  - files_external
  - twofactor_totp
  - user_ldap
Nextcloud configuration
Nextcloud config 
{
    "system": {
        "appstoreenabled": false,
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": false
            }
        ],
        "logfile": "\/var\/log\/nextcloud.log",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": "6379",
            "password": "***REMOVED SENSITIVE VALUE***",
            "timeout": 1.5
        },
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "15.0.5.3",
        "overwrite.cli.url": "http:\/\/localhost",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "theme": "",
        "loglevel": 2,
        "maintenance": false
    }
}
Client configuration

Browser: Chrome 72.0.3626.109 (Official Build) (64-bit)
Operating system: Windows 10 17763.316

Logs
Nextcloud log (data/owncloud.log)
Nextcloud log 
Deploying Nextcloud 15.0.5.3...
Deployment finished.
Configuring Nextcloud to use Redis-based session storage.
[05-Mar-2019 03:10:18] NOTICE: fpm is running, pid 1
[05-Mar-2019 03:10:18] NOTICE: ready to handle connections
127.0.0.1 -  05/Mar/2019:03:10:39 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:10:42 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:00 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:12 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:12 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:12 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:12 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:14 +0000 "GET /ocs/v2.php" 200
127.0.0.1 -  05/Mar/2019:03:11:14 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:14 +0000 "PROPFIND /remote.php" 207
127.0.0.1 -  05/Mar/2019:03:11:14 +0000 "GET /index.php" 201
127.0.0.1 -  05/Mar/2019:03:11:18 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:19 +0000 "GET /ocs/v2.php" 200
127.0.0.1 -  05/Mar/2019:03:11:19 +0000 "GET /ocs/v2.php" 200
127.0.0.1 -  05/Mar/2019:03:11:19 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:11:49 +0000 "GET /ocs/v2.php" 200
127.0.0.1 -  05/Mar/2019:03:12:20 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:21 +0000 "GET /cron.php" 200
127.0.0.1 -  05/Mar/2019:03:12:22 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:24 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:39 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:39 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:39 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:39 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:40 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:41 +0000 "GET /cron.php" 200
127.0.0.1 -  05/Mar/2019:03:12:41 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:12:42 +0000 "GET /ocs/v2.php" 204
127.0.0.1 -  05/Mar/2019:03:12:43 +0000 "GET /index.php" 200
127.0.0.1 -  05/Mar/2019:03:13:18 +0000 "PUT /remote.php" 415
{"reqId":"d5zWaJtaKEA5cnDQQcec","level":2,"time":"2019-03-05T03:13:19+00:00","remoteAddr":"67.241.72.73","user":"admin","app":"files_antivirus","method":"PUT","url":"\/remote.php\/webdav\/eicar.txt","message":"Infected file deleted. Eicar-Test-Signature Account: admin Path: files\/eicar.txt.ocTransferId413104186.part","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/72.0.3626.109 Safari\/537.36","version":"15.0.5.3"}
{"reqId":"d5zWaJtaKEA5cnDQQcec","level":4,"time":"2019-03-05T03:13:19+00:00","remoteAddr":"67.241.72.73","user":"admin","app":"files_antivirus","method":"PUT","url":"\/remote.php\/webdav\/eicar.txt","message":"Infected file deleted. Eicar-Test-Signature File: files\/eicar.txt.ocTransferId413104186.part Account: admin","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/72.0.3626.109 Safari\/537.36","version":"15.0.5.3"}
{"reqId":"d5zWaJtaKEA5cnDQQcec","level":3,"time":"2019-03-05T03:13:19+00:00","remoteAddr":"67.241.72.73","user":"admin","app":"no app in context","method":"PUT","url":"\/remote.php\/webdav\/eicar.txt","message":{"Exception":"OCP\\Files\\InvalidContentException","Message":"Virus Eicar-Test-Signature is detected in the file. Upload cannot be completed.","Code":0,"Trace":[{"function":"OCA\\Files_Antivirus\\{closure}","class":"OCA\\Files_Antivirus\\AvirWrapper","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"\/var\/www\/html\/3rdparty\/icewind\/streams\/src\/CallbackWrapper.php","line":121,"function":"call_user_func","args":[{"__class__":"Closure"}]},{"file":"\/var\/www\/html\/custom_apps\/files_antivirus\/lib\/AvirWrapper.php","line":94,"function":"stream_close","class":"Icewind\\Streams\\CallbackWrapper","type":"->","args":[]},{"file":"\/var\/www\/html\/lib\/private\/Files\/Storage\/Wrapper\/Wrapper.php","line":630,"function":"writeStream","class":"OCA\\Files_Antivirus\\AvirWrapper","type":"->","args":["files\/eicar.txt.ocTransferId413104186.part",null,null]},{"file":"\/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/File.php","line":182,"function":"writeStream","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->","args":["files\/eicar.txt.ocTransferId413104186.part",null]},{"file":"\/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/Directory.php","line":156,"function":"put","class":"OCA\\DAV\\Connector\\Sabre\\File","type":"->","args":[null]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1096,"function":"createFile","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->","args":["eicar.txt",null]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["eicar.txt",null,null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/html\/apps\/dav\/appinfo\/v1\/webdav.php","line":80,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/html\/remote.php","line":163,"args":["\/var\/www\/html\/apps\/dav\/appinfo\/v1\/webdav.php"],"function":"require_once"}],"File":"\/var\/www\/html\/custom_apps\/files_antivirus\/lib\/AvirWrapper.php","Line":154,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/72.0.3626.109 Safari\/537.36","version":"15.0.5.3"}
{"reqId":"d5zWaJtaKEA5cnDQQcec","level":4,"time":"2019-03-05T03:13:19+00:00","remoteAddr":"67.241.72.73","user":"admin","app":"webdav","method":"PUT","url":"\/remote.php\/webdav\/eicar.txt","message":{"Exception":"OCA\\DAV\\Connector\\Sabre\\Exception\\UnsupportedMediaType","Message":"Virus Eicar-Test-Signature is detected in the file. Upload cannot be completed.","Code":0,"Trace":[{"file":"\/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/File.php","line":226,"function":"convertToSabreException","class":"OCA\\DAV\\Connector\\Sabre\\File","type":"->","args":[{"__class__":"OCP\\Files\\InvalidContentException"}]},{"file":"\/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/Directory.php","line":156,"function":"put","class":"OCA\\DAV\\Connector\\Sabre\\File","type":"->","args":[null]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1096,"function":"createFile","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->","args":["eicar.txt",null]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["eicar.txt",null,null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/html\/apps\/dav\/appinfo\/v1\/webdav.php","line":80,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/html\/remote.php","line":163,"args":["\/var\/www\/html\/apps\/dav\/appinfo\/v1\/webdav.php"],"function":"require_once"}],"File":"\/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/File.php","Line":595,"Previous":{"Exception":"OCP\\Files\\InvalidContentException","Message":"Virus Eicar-Test-Signature is detected in the file. Upload cannot be completed.","Code":0,"Trace":[{"function":"OCA\\Files_Antivirus\\{closure}","class":"OCA\\Files_Antivirus\\AvirWrapper","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"\/var\/www\/html\/3rdparty\/icewind\/streams\/src\/CallbackWrapper.php","line":121,"function":"call_user_func","args":[{"__class__":"Closure"}]},{"file":"\/var\/www\/html\/custom_apps\/files_antivirus\/lib\/AvirWrapper.php","line":94,"function":"stream_close","class":"Icewind\\Streams\\CallbackWrapper","type":"->","args":[]},{"file":"\/var\/www\/html\/lib\/private\/Files\/Storage\/Wrapper\/Wrapper.php","line":630,"function":"writeStream","class":"OCA\\Files_Antivirus\\AvirWrapper","type":"->","args":["files\/eicar.txt.ocTransferId413104186.part",null,null]},{"file":"\/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/File.php","line":182,"function":"writeStream","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->","args":["files\/eicar.txt.ocTransferId413104186.part",null]},{"file":"\/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/Directory.php","line":156,"function":"put","class":"OCA\\DAV\\Connector\\Sabre\\File","type":"->","args":[null]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1096,"function":"createFile","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->","args":["eicar.txt",null]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["eicar.txt",null,null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/nextcloud.example.com\/remote.php\/webdav\/eicar.txt","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/html\/apps\/dav\/appinfo\/v1\/webdav.php","line":80,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/html\/remote.php","line":163,"args":["\/var\/www\/html\/apps\/dav\/appinfo\/v1\/webdav.php"],"function":"require_once"}],"File":"\/var\/www\/html\/custom_apps\/files_antivirus\/lib\/AvirWrapper.php","Line":154},"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/72.0.3626.109 Safari\/537.36","version":"15.0.5.3"}
127.0.0.1 -  05/Mar/2019:03:13:40 +0000 "GET /ocs/v2.php" 200
Browser log
Browser log 
Request URL: https://example.com/remote.php/webdav/eicar.txt
Request Method: PUT
Status Code: 415 
Remote Address: ***REMOVED SENSITIVE VALUE***
Referrer Policy: no-referrer
cache-control: no-store, no-cache, must-revalidate
content-security-policy: default-src 'none';
content-type: application/xml; charset=utf-8
date: Tue, 05 Mar 2019 03:37:39 GMT
expires: Thu, 19 Nov 1981 08:52:00 GMT
pragma: no-cache
server: nginx/1.15.8
status: 415
strict-transport-security: max-age=15724800; includeSubDomains
x-frame-options: SAMEORIGIN
:authority: example.com
:method: PUT
:path: /remote.php/webdav/eicar.txt
:scheme: https
accept: */*
accept-encoding: gzip, deflate, br
accept-language: en-US,en;q=0.9
cache-control: no-cache
content-disposition: attachment; filename="eicar.txt"
content-length: 68
content-type: text/plain
cookie: ***REMOVED SENSITIVE VALUE***
if-none-match: *
ocs-apirequest: true
origin: https://example.com
pragma: no-cache
requesttoken: FmCzvHlyNMw18NZuAg6tPpefecOZQd0/CrYgTgOBA/c=:JgLclzofV+NZvuQeUWiZXfvMH6LBDpBJO+dNB2jqRZQ=
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36
x-requested-with: XMLHttpRequest

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with custom_apps/files_antivirus/lib/AvirWrapper.php and apps/dav/lib/Connector/Sabre/File.php, which appear in the trace, and reproduce the EICAR upload described in the issue. Compare how the detected-virus exception is handled with the behavior in Nextcloud 15.0.2. Done means the upload remains blocked and the user sees “Infected file deleted. Eicar-Test-Signature” instead of the generic error.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
backend, security
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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