156 lines
6.9 KiB
JSON
156 lines
6.9 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-2026-18568",
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"assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
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"state": "PUBLISHED",
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"assignerShortName": "CPANSec",
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"dateReserved": "2026-08-02T00:59:21.745Z",
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"datePublished": "2026-08-03T14:38:52.540Z",
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"dateUpdated": "2026-08-03T20:05:52.443Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://cpan.org/modules",
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"defaultStatus": "unaffected",
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"packageName": "XML-Sig",
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"product": "XML::Sig",
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"programFiles": [
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"lib/XML/Sig.pm"
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],
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"programRoutines": [
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{
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"name": "XML::Sig::verify"
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}
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],
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"repo": "https://github.com/perl-net-saml2/perl-XML-Sig",
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"vendor": "TIMLEGGE",
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"versions": [
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{
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"lessThan": "0.72",
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"status": "affected",
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"version": "0.29",
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"versionType": "custom"
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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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"lang": "en",
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"value": "XML::Sig versions from 0.29 before 0.72 for Perl allow signature verification bypass because verify returns true when every signature was skipped before any cryptographic check.\n\nverify in lib/XML/Sig.pm counts the `//dsig:Signature` elements into `$numsigs` and iterates over them, but two paths reach `next` before any digest or key check runs: a `SignedInfo/Reference/@URI` that resolves to no element while `$numsigs` is greater than 1, and, when `id_attr` is set, a reference that does not match the requested ID. The loop records nothing about what it checked, so when every signature takes one of those paths control reaches the unconditional `return 1` that ends verify. Two `Signature` elements whose Reference URI names an ID that no element carries is enough, as is one such element combined with `id_attr`.\n\nAny caller that passes untrusted XML to verify can receive a true return for a document in which no digest and no signature value was checked; a `cert` or `cert_text` trust anchor does not change this, because no key check runs. Versions up to 0.28 use an XML::XPath based verify that has no such skip and are not affected."
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-347",
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"description": "CWE-347 Improper Verification of Cryptographic Signature",
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"lang": "en",
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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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"providerMetadata": {
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"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
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"shortName": "CPANSec",
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"dateUpdated": "2026-08-03T14:38:52.540Z"
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},
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"references": [
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/perl-net-saml2/perl-XML-Sig/commit/ef22cfed1ac0f29b316d17eb79cf6480e03ae16a.patch"
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},
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{
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"tags": [
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"release-notes"
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],
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"url": "https://metacpan.org/release/TIMLEGGE/XML-Sig-0.72/changes"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-40934"
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}
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],
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"solutions": [
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{
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"lang": "en",
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"value": "Upgrade to XML::Sig 0.72 or later, which returns false when no reference digest was checked and matched."
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}
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],
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"source": {
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"discovery": "UNKNOWN"
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},
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"timeline": [
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{
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"lang": "en",
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"time": "2026-08-03T00:00:00.000Z",
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"value": "Version 0.72 released with fix."
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}
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],
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"title": "XML::Sig versions from 0.29 before 0.72 for Perl allow signature verification bypass because verify returns true when every signature was skipped before any cryptographic check",
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"x_generator": {
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"engine": "cpansec-cna-tool 0.1"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.5,
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"attackVector": "NETWORK",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "NONE",
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"privilegesRequired": "NONE",
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"confidentialityImpact": "NONE"
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}
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},
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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": "2026-08-03T20:05:13.814301Z",
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"id": "CVE-2026-18568",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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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": "2026-08-03T20:05:52.443Z"
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}
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}
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]
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}
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} |