| 제목 | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authentication |
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| 설명 | OpenDMARC incorrectly stops DMARC policy discovery when a subdomain publishes a record with an unsupported or malformed version value. Instead of discarding the unusable record and continuing the organizational-domain lookup, OpenDMARC returns `dmarc=permerror` and does not apply the parent domain’s `sp=` policy.
As a result, a subdomain that should be protected by a parent-level `sp=reject` or `sp=quarantine` policy may be treated as having no enforceable DMARC policy. A remote unauthenticated attacker can exploit the condition by sending forged messages from an affected subdomain.
The issue requires an unusable DMARC record, such as one containing `v=DMARC2` or `v=DMARC1.0`, to exist at the subdomain. If no record is present, OpenDMARC correctly continues to the parent domain. |
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| 원천 | ⚠️ https://xuyongzhe-vt.github.io/share/opendmarc-subdomain-walk-abort.html |
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| 사용자 | yongzhe_xu (UID 100420) |
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| 제출 | 2026. 08. 07. AM 04:38 (2 개월 ago) |
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| 모더레이션 | 2026. 09. 27. PM 01:33 (2 months later) |
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| 상태 | 수락 |
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| VulDB 항목 | 410887 [Trusted Domain Project OpenDMARC 까지 1.4.2 opendmarc_policy.c strcasecmp 권한 상승] |
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| 포인트들 | 20 |
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