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‎advisories/github-reviewed/2025/12/GHSA-6gvq-jcmp-8959/GHSA-6gvq-jcmp-8959.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-6gvq-jcmp-8959",
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"modified": "2025-12-16T00:43:52Z",
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"published": "2025-12-16T00:43:52Z",
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"aliases": [
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"CVE-2025-68113"
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],
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"summary": "ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay",
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"details": "### Impact\n\nA cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind challenge parameters to the nonce, allowing an attacker to reinterpret a valid proof-of-work submission with a modified expiration value. This may allow previously solved challenges to be reused beyond their intended lifetime, depending on server-side replay handling and deployment assumptions.\n\nThe vulnerability primarily impacts abuse-prevention mechanisms such as rate limiting and bot mitigation. It does not directly affect data confidentiality or integrity. \n\n### Patches\n\nThis issue has been addressed by enforcing explicit semantic separation between challenge parameters and the nonce during HMAC computation.\n\nUsers are advised to upgrade to patched versions.\n\n### Workarounds\n\nAs a mitigation, implementations may append a delimiter to the end of the `salt` value prior to HMAC computation (for example, `<salt>?expires=<time>&`). This prevents ambiguity between parameters and the nonce and is backward-compatible with existing implementations, as the delimiter is treated as a standard URL parameter separator.",
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"severity": [
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{
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"type": "CVSS_V3",
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"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "npm",
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"name": "altcha-lib"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "1.4.1"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "altcha-org/altcha"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "1.3.1"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/altcha-org/altcha-lib-go"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "1.0.0"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Maven",
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"name": "org.altcha:altcha"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "1.3.0"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "RubyGems",
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"name": "altcha"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "1.0.0"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "PyPI",
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"name": "altcha"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "1.0.0"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Hex",
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"name": "altcha"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "1.0.0"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib/security/advisories/GHSA-6gvq-jcmp-8959"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib-ex/commit/09b2bad466ad0338a5b24245380950ea9918333e"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib-go/commit/4a5610745ef79895a67bac858b2e4f291c2614b8"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib-java/commit/69277651fdd6418ae10bf3a088901506f9c62114"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib-php/commit/9e9e70c864a9db960d071c77c778be0c9ff1a4d0"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib-rb/commit/4fd7b64cbbfc713f3ca4e066c2dd466e3b8d359b"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib/commit/cb95d83a8d08e273b6be15e48988e7eaf60d5c08"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/altcha-org/altcha-lib"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib-java/releases/tag/v1.3.0"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib-php/releases/tag/v1.3.1"
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},
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{
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"type": "WEB",
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"url": "https://github.com/altcha-org/altcha-lib/releases/tag/1.4.1"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-115",
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"CWE-347"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2025-12-16T00:43:52Z",
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"nvd_published_at": null
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}
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}

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