Google and Mozilla fixed issues exploited at 2020 Tianfu Cup hacking contest

Pierluigi Paganini November 11, 2020

Mozilla and Google have already fixed the critical flaws in Firefox and Chrome exploited by bug bounty hunters at 2020 Tianfu Cup hacking contest.

Mozilla and Google have already addressed the critical Firefox and Chrome vulnerabilities that were recently exploited by white hat hackers at the 2020 Tianfu Cup hacking contest.

The vulnerability in Chrome exploited by hackers at the 2020 Tianfu Cup, tracked as CVE-2020-16016, is an inappropriate implementation issue that resided in the base component. Google addressed the flaw with the release of Chrome 86.

The CVE-2020-16016 flaw, along with the CVE-2020-26950 issue, was exploited by a team named “360 Enterprise Security and Government and (ESG) Vulnerability Research Institute,” which is part of the Chinese tech giant Qihoo 360 that won the competition. The team earned $744,500 of the total $1,210,000 jackpot.CVE-2020-26950, were exploited demonstrated by a team from Chinese cybersecurity firm Qihoo 360. This team earned over $740,000 of the total of $1.2 million awarded to participants at Tianfu Cup. For the Firefox vulnerability they earned $40,000, while for the Chrome flaw, which allowed them to achieve remote code execution with a sandbox escape, they received $100,000.

The Firefox vulnerability, tracked as CVE-2020-26950, is related to write side effects in MCallGetProperty opcode not being accounted for.

“In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition,” reads the advisory published by Mozilla.

Mozilla addressed the issue with the release of Firefox 82.0.3, Firefox ESR 78.4.1 and Thunderbird 78.4.2.

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Pierluigi Paganini

(SecurityAffairs – hacking, 2020 Tianfu Cup)

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