{"id":"GHSA-7h24-c332-p48c","summary":"vproxy Divide by Zero DoS Vulnerability","details":"### Summary\nUntrusted, user-controlled data from the HTTP Proxy-Authorization header can induce a denial of service state.\n\n### Details\nUntrusted data is extracted from the user-controlled HTTP Proxy-Authorization header and passed to Extension::try_from and flows into parse_ttl_extension where it is parsed as a TTL value. If an attacker supplies a TTL of zero (e.g. by using a username such as 'configuredUser-ttl-0'), the modulo operation 'timestamp % ttl' will cause a division by zero panic, causing the server to crash causing a denial-of-service.\n\nThe code assumed to be responsible for this can be found here: https://github.com/0x676e67/vproxy/blob/ab304c3854bf8480be577039ada0228907ba0923/src/extension.rs#L173-L183\n\n### PoC\n1. Download and run the latest version of vproxy\n2. Send a cUrl request like the following, adjusting address and port as necessary: ```curl -x \"http://test-ttl-0:test@127.0.0.1:8101\" https://google.com```\n3. Wait for a cUrl error indicating \"Proxy CONNECT aborted\"\n4. View logs from the vproxy server\n5. Observe that the vproxy server crashed due to a divide-by-zero panic\n\n### Impact\nThe resulting crash renders the proxy server unusable until it is reset.\n\nFinally, one last note: I'm reporting this on behalf of another researcher at Black Duck. Credit for discovery should be attributed to David Bohannon ([dbohannon](https://github.com/dbohannon))","aliases":["CVE-2025-54581"],"modified":"2025-07-31T11:18:29Z","published":"2025-07-30T16:33:41Z","database_specific":{"nvd_published_at":"2025-07-30T20:15:37Z","cwe_ids":["CWE-369"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2025-07-30T16:33:41Z"},"references":[{"type":"WEB","url":"https://github.com/0x676e67/vproxy/security/advisories/GHSA-7h24-c332-p48c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-54581"},{"type":"WEB","url":"https://github.com/0x676e67/vproxy/commit/aa1bf64c5e7f1c471395f9f29175ffc1b16a1079"},{"type":"PACKAGE","url":"https://github.com/0x676e67/vproxy"},{"type":"WEB","url":"https://github.com/0x676e67/vproxy/releases/tag/v2.4.0"}],"affected":[{"package":{"name":"vproxy","ecosystem":"crates.io","purl":"pkg:cargo/vproxy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.4.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-7h24-c332-p48c/GHSA-7h24-c332-p48c.json","last_known_affected_version_range":"\u003c= 2.3.3"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}