Celebrating $20M in Bounties with a Recap of Our Top 20 Up Voted Reports on Hacktivity

Aug 28 2017
HackerOne

Hacktivity is one of the most popular pages on hackerone.com. And for good reason as it’s a veritable treasure trove of learning for hackers and a wonderful way for companies to practice transparency and showcase their security efforts.

In honor of our $20M in bounties paid out to hackers (yay!), we thought we’d revisit some of the top most up voted reports ever submitted on HackerOne.

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And here they are, in descending order, with a corresponding cat gif (because, the internet is awesome). Congrats to all hackers in the list, you’re making the internet safer day by day!

20. (102 upvotes) Stealing xoxs-tokens using weak postMessage / call-popup redirect to current team domain
$3,000 awarded to @fransrosen by Slack for finding a vulnerability which would allow an attacker running a malicious site to steal XOXS tokens.

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19. (104 upvotes) Subdomain takeover at info.hacker.one
$1,000 awarded to @ak1t4 by HackerOne for discovering a CNAME entry for unbouncepages.com that allowed takeover of hundreds of managed domains.

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18. (110 upvotes) Disclose any user's private email through API
$2,000 awarded to @zombiehelp54 by HackerOne for finding a vulnerability that allows an attacker to disclose any user’s private email address.

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17. (111 upvotes) Round error issue -> produce money for free
$1,000 awarded to @4lemon by itBit Exchange for finding a way to exploit a rounding error during financial transactions to “make money.”

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16. (114 upvotes) Reading Emails in Uber Subdomains
$10,000 awarded to @uranium238 by Uber for discovering a bug that allowed reading emails from various subdomains.

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15. (116 upvotes) Authentication bypass on auth.uber.com via subdomain takeover of saostatic.uber.com
$5,000 awarded to @arneswinnen by Uber for finding access to subdomains by bypassing the SSO login system.

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14. (119) Web Authentication Endpoint Credentials Brute-Force Vulnerability
$1,500 awarded to @arneswinnen by HackerOne for discovering an inferior request rate-limiting mechanism, which provided inadequate protection against brute force attacks.

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13. (122 upvotes) Hacker.One Subdomain Takeover
$1,000 awarded to @geekboy by HackerOne for exploiting an Instapage cname bug to to takeover a subdomain.

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12. (125 upvotes) Multiple endpoints are vulnerable to XML External Entity injection (XXE)
$2,500 awarded to @mak by Pornhub for finding multiple endpoints vulnerable to XML External Entity injection, enabling arbitrary requests from a production server.

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11. (161 upvotes) Stored XSS in developer.uber.com
$7,500 awarded to @albinowax by Uber for discovering a method for permanently defacing of an entire domain.

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10. (166 upvotes) RCE by command line argument injection to `gm convert` in `/edit/process?a=crop`
$5,000 awarded to @neex by Imgur for finding a command line argument injection vulnerability that would lead to command execution.

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9. (174 upvotes) Publicly exposed SVN repository, ht.pornhub.com
$10,000 awarded to @mak by Pornhub for discovering a means for accessing a public .svn repository, which exposed usernames and provided subsequent access to production servers.

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8. (175 upvotes) XXE on sms-be-vip.twitter.com in SXMP Processor
$10,080 awarded to @joshbrodienz by Twitter for finding a bug that exposed local files and allowed sending of web requests.

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7. (200 upvotes) Internal attachments can be exported via "Export as .zip" feature
$12,500 awarded to @japzdivino by HackerOne for discovering a vulnerability that inadvertently included private, internal files when any user exported the complete report.

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6. (210 upvotes) Information Disclosure in /skills call
$10,000 awarded to @deepankerchawla by HackerOne for finding a vulnerability that exposed bug reports submitted by other HackerOne community members, including confidential report descriptions.

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5. (223 upvotes) Change any Uber user's password through /rt/users/passwordless-signup - Account Takeover (critical)
$10,000 awarded to @mongo by Uber for discovering a vulnerability which allowed a password change just by entering any Uber-registered phone number.

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4. (262 upvotes) Partial disclosure of report activity through new "Export as .zip" feature
$10,000 awarded to @faisalahmed by HackerOne for finding a vulnerability that allowed viewing comments not normally visible in a limited disclosure.

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3. (290 upvotes) Open prod Jenkins instance
$15,000 awarded to @preben_ve by Snapchat for discovering a Jenkins instance which would allow login with any valid Google account and further enable access to sensitive API tokens and source code.

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2. (432 upvotes) [phpobject in cookie] Remote shell/command execution
$20,000 awarded to @static by Pornhub for finding a vulnerable deserialization function in PHP leading to remote shell on a production server.

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1. (478 votes) WannaCrypt “Killswitch”
$10,000 awarded to @malwaretech by HackerOne for identifying the “killswitch” for the  May 2017 global ransomware attack, which the hacker disclosed here.

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