| 제목 | The Trusted Domain Project OpenDMARC 1.4.2 NULL Pointer Dereference |
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| 설명 | 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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| 원천 | ⚠️ https://weitongli.com/share/opendmarc-ip6-wild-pointer.html |
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| 사용자 | WeitongLi (UID 100239) |
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| 제출 | 2026. 08. 06. PM 12:10 (2 개월 ago) |
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| 모더레이션 | 2026. 09. 27. AM 09:55 (2 months later) |
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| 상태 | 수락 |
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| VulDB 항목 | 410840 [Trusted Domain Project OpenDMARC 까지 1.4.2 SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode cp 서비스 거부] |
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| 포인트들 | 20 |
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