146 lines
6.5 KiB
JSON
146 lines
6.5 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-45721",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-05-13T05:51:48.666Z",
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"datePublished": "2026-05-26T16:34:49.985Z",
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"dateUpdated": "2026-05-26T17:15:34.450Z"
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},
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"containers": {
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"cna": {
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"title": "Algernon: handler.lua discovery walks parent directories above the server root",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-20",
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"lang": "en",
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"description": "CWE-20: Improper Input Validation",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-426",
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"lang": "en",
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"description": "CWE-426: Untrusted Search Path",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-552",
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"lang": "en",
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"description": "CWE-552: Files or Directories Accessible to External Parties",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "HIGH",
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"attackVector": "NETWORK",
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"availabilityImpact": "HIGH",
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"baseScore": 9,
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"baseSeverity": "CRITICAL",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"privilegesRequired": "NONE",
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"scope": "CHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
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"version": "3.1"
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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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"name": "https://github.com/xyproto/algernon/security/advisories/GHSA-xwcr-wm99-g9jc",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/xyproto/algernon/security/advisories/GHSA-xwcr-wm99-g9jc"
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}
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],
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"affected": [
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{
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"vendor": "xyproto",
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"product": "algernon",
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"versions": [
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{
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"version": "< 1.17.7",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-05-26T16:34:49.985Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is asked for any URL path that resolves to a directory without an index file, DirPage walks upward through parent directories — past the configured server root — looking for a file named handler.lua to execute as the request handler. The loop terminates only after 100 ancestor steps or when filepath.Dir returns ., so on any absolute server-root path the search reaches the filesystem root (/ on Unix, drive letter on Windows). The first handler.lua it finds is loaded into the Lua interpreter with the full Algernon API exposed — including run3(), httpclient, os.execute, io.popen, PQ, MSSQL, raw filesystem access, and the userstate database. Any process that can write handler.lua anywhere in a parent directory of the server root obtains pre-authenticated remote code execution on the next HTTP request. This is reachable without authentication — the lookup happens before the permission check returns a hit (the perm system only gates URL prefixes, not the handler-resolution step), and any URL pointing at a directory without an index triggers the walk. On a fresh stock Algernon install the request GET / is enough. This vulnerability is fixed in 1.17.7."
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}
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],
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"source": {
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"advisory": "GHSA-xwcr-wm99-g9jc",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/xyproto/algernon/security/advisories/GHSA-xwcr-wm99-g9jc",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-05-26T17:13:14.630410Z",
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"id": "CVE-2026-45721",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-05-26T17:15:34.450Z"
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}
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}
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]
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}
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} |