On December 1, 2024, Spectral\u2019s Syntax V2 bonding contract was exploited due to an infinite approval vulnerability in the AgentToken.sol contract. The attacker leveraged a flash loan to manipulate token approvals, enabling the transfer of almost all AgentToken.sol funds from the bonding contract, disrupting the bonding curve calculations.<\/p>\n
By artificially reducing token balances, the attacker caused the curve to misprice tokens, allowing them to extract a disproportionately large amount of SPEC tokens from the liquidity pool. A total of 14,793 SPEC tokens, worth approximately $250,000, were drained in the\u00a0attack.<\/p>\n
Spectral<\/a> is at the forefront of a decentralized revolution, envisioning a future where onchain agents are not just a luxury for the tech-savvy but an accessible tool for everyone. Their\u2019s mission is to transform the way individuals interact with the crypto ecosystem by establishing the Onchain Agent Economy<\/strong>\u200a\u2014\u200aa pioneering framework that empowers users to create, own, and govern autonomous agents capable of executing sophisticated strategies round the\u00a0clock.<\/p>\n Vulnerable Contract: 0xD84B6CAccFCc9FA5F48c6277C40FaC0620f1d0c2<\/a><\/p>\n Attacker Address\u00a0: 0x000000000000E921f69f1df9E0540ccdD4847A0D<\/a><\/p>\n Attacker Contract Address\u00a0: 0x637A5Cdd63Eae6A673bE0fFbFBaf9830F905044c<\/a><\/p>\n Attack Transaction: 0xa3535c70c<\/a><\/p>\n The attacker borrowed SPEC tokens through a flash loan to have sufficient initial liquidity for the\u00a0exploit.<\/p>\n The attacker swapped the borrowed SPEC tokens for AgentToken.sol tokens in the AutonomousAgentDeployer.solcontract using the swapExactSPECForTokens function.<\/p>\n The attacker swapped the AgentToken.sol back for SPEC in the AutonomousAgentDeployer.sol contract through swapExactTokensForSPEC\u00a0.<\/p>\n The AutonomousAgentDeployer.sol calls safeTransferFrom to transfer tokens from the user to\u00a0it.<\/p>\n Since AgentToken.sol is being transferred back to the AgentBalances.sol contract, the transfer tax is applied since it is an contract.<\/p>\n Inside the tax calculation code, a faulty line granted infinite approval<\/strong> of AgentToken.sol for the AgentBalances.solcontract. (See at line\u00a090)<\/p>\n To exploit this, the attacker called the deposit function on the AgentBalances.sol contract.<\/p>\n This function allowed them to transfer nearly all available AgentToken.sol balances from AutonomousAgentDeployer.sol to AgentBalances.sol. This leads to the manipulation of bonding\u00a0curve.<\/p>\n The bonding curve, using an XYK (constant product) formula, miscalculated the value of AgentToken.sol, making it appear much more valuable than it actually\u00a0was.<\/p>\n The attacker used the inflated price of AgentToken.sol to swap a small amount of it back for an outsized amount of SPEC tokens in the liquidity pool.<\/p>\n By repeating the above process, the attacker drained approximately 14,793 SPEC tokens from the bonding curve, worth around $250,000 at the\u00a0time.<\/p>\n The root cause of the exploit was an unintended infinite approval in the AgentToken.sol contract during tax calculation. This approval granted the AgentBalances.sol contract unrestricted access to spend AgentToken.sol from the AutonomousAgentDeployer.sol contract.<\/p>\n The attacker exploited this oversight to manipulate token balances, causing the bonding curve to misprice tokens and allowing them to drain liquidity.<\/p>\n See the funds flow\u00a0here<\/a>:<\/p>\n The team responded to the exploit quickly through their twitter(x) account.<\/p>\n https:\/\/medium.com\/media\/c988417c2831d9ebc4a9e525f329e6ad\/href<\/a><\/p>\n Avoid Unnecessary Infinite Approvals<\/strong>: The approval logic in the tax mechanism should have been avoided entirely unless explicitly necessary.The deposit() function on AgentBalances.sol should have been restricted to trusted entities or removed entirely from public access, ensuring only authorized users or contracts could call\u00a0it.Collaborate with reputable auditors like QuillAudits<\/strong> to analyse smart contracts and identify vulnerabilities.<\/p>\n Choosing a reputable audit firm like QuillAudits ensures that your protocol undergoes rigorous scrutiny<\/a> from experienced security professionals. QuillAudits specializes in uncovering critical vulnerabilities and providing actionable remediation strategies. Our expertise helps safeguard your project from attacks, ensuring that security issues are addressed proactively.<\/p>\n Decoding Spectra Lab\u2019s Bonding Contract $250K Exploit<\/a> was originally published in Coinmonks<\/a> on Medium, where people are continuing the conversation by highlighting and responding to this story.<\/p>","protected":false},"excerpt":{"rendered":" Overview On December 1, 2024, Spectral\u2019s Syntax V2 bonding contract was exploited due to an infinite approval vulnerability in the AgentToken.sol contract. The attacker leveraged a flash loan to manipulate token approvals, enabling the transfer of almost all AgentToken.sol funds from the bonding contract, disrupting the bonding curve calculations. By artificially reducing token balances, the […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-28790","post","type-post","status-publish","format-standard","hentry","category-interesting"],"_links":{"self":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/28790"}],"collection":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=28790"}],"version-history":[{"count":0,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/28790\/revisions"}],"wp:attachment":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Exploit Details<\/h3>\n
Attack Process<\/h3>\n
The Root\u00a0Cause<\/h3>\n
Flow of\u00a0Funds<\/h3>\n
Post Exploit\u00a0Scenes:<\/h3>\n
How could they have prevented the\u00a0Exploit?<\/h3>\n
Why QuillAudits?<\/h3>\n