| タイトル | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authentication |
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| 説明 | 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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| ソース | ⚠️ https://xuyongzhe-vt.github.io/share/opendmarc-subdomain-walk-abort.html |
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| ユーザー | yongzhe_xu (UID 100420) |
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| 送信 | 2026年08月07日 04:38 (2 月 ago) |
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| モデレーション | 2026年09月27日 13:33 (2 months later) |
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| ステータス | 承諾済み |
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| VulDBエントリ | 410887 [Trusted Domain Project OpenDMARC 迄 1.4.2 opendmarc_policy.c strcasecmp 特権昇格] |
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| ポイント | 20 |
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