| タイトル | The Trusted Domain Project OpenDMARC 1.4.2 NULL Pointer Dereference |
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| 説明 | OpenDMARC contains an invalid pointer dereference in its built-in SPF parser when processing a malformed IPv6 literal in an `ip6:` mechanism. In `opendmarc_spf_ipv6_explode()`, the parser may advance past a failed delimiter search and subsequently dereference an invalid address, causing the process to crash.
A remote unauthenticated attacker can trigger the vulnerability by publishing a crafted SPF record under a domain they control and sending a message from that domain. Successful exploitation terminates the OpenDMARC process, disrupting DMARC and SPF evaluation and potentially causing a denial of service in mail processing.
The issue affects builds configured with `--with-spf` that use OpenDMARC’s internal SPF implementation. Builds linked against `libspf2` do not reach the affected code path. |
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| ソース | ⚠️ https://weitongli.com/share/opendmarc-ip6-wild-pointer.html |
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| ユーザー | WeitongLi (UID 100239) |
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| 送信 | 2026年08月06日 12:10 (2 月 ago) |
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| モデレーション | 2026年09月27日 09:55 (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 | 410840 [Trusted Domain Project OpenDMARC 迄 1.4.2 SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode cp サービス拒否] |
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| ポイント | 20 |
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