Nexus Mutual Fund Pool Vulnerable

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Nexus Mutual

Nexus Mutual initially launched with a critical vulnerability which put the funds at risk. This was resolved before it could be exploited.

This is a global/international case not involving a specific country.

About Nexus Mutual

Nexus Mutual is "[a] people-powered alternative to insurance".

"Nexus Mutual uses the power of Ethereum so people can share risk together without the need for an insurance company." "Nexus Mutual is run entirely by its members. Only members can decide which claims are valid. All member decisions are recorded and enforced by smart contracts on the Ethereum public blockchain."

The fund claims it "will always put the security of our protocol and the safety of our members funds above anything else." "The Mutual’s code was audited by the Solidified team in April 2019 prior to its mainnet launch back in May."

"On February 20th, the core team received [a] report from renowned security researcher Samczsun outlining a vulnerability that could put a significant portion of the mutual’s funds at risk." "[T]he vulnerability allowed any third party to trigger a treasury rebalance at any point in time."

"The mutual’s funds are currently held entirely in DAI and ETH. Whenever a claim is accepted, the mutual must ensure enough funds in the corresponding asset are available to pay out the claimant. If the amount being paid exceeds a certain threshold, the protocol exchanges the required amount in several batches with a time delay in-between. With this, the system relied on Oraclize to trigger the rebalance via Uniswap."

"We do acknowledge that there have been warnings against using Uniswap in this way and it is known to be susceptible to this type of attack. The bZx hack should have been a huge red flag for us as well, but we were overwhelmed by our product being put to its first real test to successfully pay a claim."

"Within 4 hours of receiving the report, the Mutual kill switched the system’s interaction with Uniswap, disabling the ability to execute this exploit." "[I]f any [immediate] claims in Dai are to be paid, Nexus Mutual will raise governance proposals to transfer the required ETH to the advisory board multi-sig, exchange them for Dai, and pay the underlying claim. In the longer-term, Nexus Mutual is aiming to integrate with a manipulation-resistant DEX and are currently evaluation options."

"Samczsun will receive a $5,000 bounty for his disclosure. The threat matrix categorized the vulnerability as a high severity issue given its potential impact and medium likelihood of being executed." "With the recent disclosures, Nexus Mutual has decided to launch a bug bounty program in the near future." "We are working on comprehensive fixes that require contract upgrades and further security reviews."

This is a global/international case not involving a specific country.

The background of the exchange platform, service, or individuals involved, as it would have been seen or understood at the time of the events.

Include:

• Known history of when and how the service was started.
• What problems does the company or service claim to solve?
• What marketing materials were used by the firm or business?
• Audits performed, and excerpts that may have been included.
• Business registration documents shown (fake or legitimate).
• How were people recruited to participate?
• Public warnings and announcements prior to the event.

Don't Include:

• Any wording which directly states or implies that the business is/was illegitimate, or that a vulnerability existed.
• Anything that wasn't reasonably knowable at the time of the event.

There could be more than one section here. If the same platform is involved with multiple incidents, then it can be linked to a main article page.

The Reality

This sections is included if a case involved deception or information that was unknown at the time. Examples include:

• When the service was actually started (if different than the "official story").
• Who actually ran a service and their own personal history.
• How the service was structured behind the scenes. (For example, there was no "trading bot".)
• Details of what audits reported and how vulnerabilities were missed during auditing.

What Happened

The specific events of the loss and how it came about. What actually happened to cause the loss and some of the events leading up to it.

Key Event Timeline - Nexus Mutual Fund Pool Vulnerable

Date	Event	Description
February 24th, 2020	Main Event	Expand this into a brief description of what happened and the impact. If multiple lines are necessary, add them here.

Technical Details

This section includes specific detailed technical analysis of any security breaches which happened. What specific software vulnerabilities contributed to the problem and how were they exploited?

Total Amount Lost

No funds were lost.

How much was lost and how was it calculated? If there are conflicting reports, which are accurate and where does the discrepancy lie?

Immediate Reactions

How did the various parties involved (firm, platform, management, and/or affected individual(s)) deal with the events? Were services shut down? Were announcements made? Were groups formed?

Ultimate Outcome

What was the end result? Was any investigation done? Were any individuals prosecuted? Was there a lawsuit? Was any tracing done?

Total Amount Recovered

There do not appear to have been any funds recovered in this case.

What funds were recovered? What funds were reimbursed for those affected users?

Ongoing Developments

What parts of this case are still remaining to be concluded?

General Prevention Policies

No user funds were lost.

Individual Prevention Policies

No specific policies for individual prevention have yet been identified in this case.

For the full list of how to protect your funds as an individual, check our Prevention Policies for Individuals guide.

Platform Prevention Policies

Policies for platforms to take to prevent this situation have not yet been selected in this case.

For the full list of how to protect your funds as a financial service, check our Prevention Policies for Platforms guide.

Regulatory Prevention Policies

No specific regulatory policies have yet been identified in this case.

For the full list of regulatory policies that can prevent loss, check our Prevention Policies for Regulators guide.