{"id":"GHSA-jf2r-x3j4-23m7","summary":"OpenVM allows the byte decomposition of pc in AUIPC chip to overflow","details":"The fix to https://cantina.xyz/code/c486d600-bed0-4fc6-aed1-de759fd29fa2/findings/21 has a typo that still results in the highest limb of `pc` being range checked to 8-bits instead of 6-bits.\n\nIn the AIR, we do https://github.com/openvm-org/openvm/blob/0f94c8a3dfa7536c1231465d1bdee5fc607a5993/extensions/rv32im/circuit/src/auipc/core.rs#L135\n```\n        for (i, limb) in pc_limbs.iter().skip(1).enumerate() {\n            if i == pc_limbs.len() - 1 {\n```\n\nIt should be\n```\n        for (i, limb) in pc_limbs.iter().enumerate().skip(1) {\n```\n\nRight now the if statement is never triggered because the enumeration gives `i=0,1,2` when we instead want `i=1,2,3`. What this means is that `pc_limbs[3]` is range checked to 8-bits instead of 6-bits.\n\nThis leads to a vulnerability where the `pc_limbs` decomposition differs from the true `pc`, which means a malicious prover can make the destination register take a different value than the AUIPC instruction dictates, by making the decomposition overflow the BabyBear field.","aliases":["CVE-2025-46723"],"modified":"2025-05-05T20:42:09.376504Z","published":"2025-05-05T19:57:09Z","database_specific":{"github_reviewed_at":"2025-05-05T19:57:09Z","nvd_published_at":"2025-05-02T23:15:16Z","cwe_ids":["CWE-131"],"severity":"HIGH","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/openvm-org/openvm/security/advisories/GHSA-jf2r-x3j4-23m7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-46723"},{"type":"WEB","url":"https://github.com/openvm-org/openvm/commit/68da4b50c033da5603517064aa0a08e1bbf70a01"},{"type":"WEB","url":"https://cantina.xyz/code/c486d600-bed0-4fc6-aed1-de759fd29fa2/findings/21"},{"type":"PACKAGE","url":"https://github.com/openvm-org/openvm"},{"type":"WEB","url":"https://github.com/openvm-org/openvm/blob/0f94c8a3dfa7536c1231465d1bdee5fc607a5993/extensions/rv32im/circuit/src/auipc/core.rs#L135"},{"type":"WEB","url":"https://github.com/openvm-org/openvm/releases/tag/v1.1.0"}],"affected":[{"package":{"name":"openvm","ecosystem":"crates.io","purl":"pkg:cargo/openvm"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"1.1.0"}]}],"versions":["1.0.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-jf2r-x3j4-23m7/GHSA-jf2r-x3j4-23m7.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:P"}]}