| 제목 | The Trusted Domain Project OpenDMARC 1.4.2 Out-of-Bounds Read |
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| 설명 | OpenDMARC contains an off-by-one error in `opendmarc_util_cleanup()` that can result in an out-of-bounds read. The function accepts input whose length is equal to the destination buffer size, leaving no space for a terminating NUL byte. The returned buffer is subsequently processed as a C string.
In the DMARC record parser, a crafted 32-character `rf=` value can therefore cause string-processing code to read beyond the end of a 32-byte stack buffer. Because DMARC records are retrieved from DNS under the sending domain’s control, a remote unauthenticated attacker can trigger the issue by publishing a malicious record and sending a message from that domain.
Successful exploitation may crash the DMARC-processing component and cause a denial of service. Potential information disclosure from adjacent stack memory has not been demonstrated. |
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| 원천 | ⚠️ https://weitongli.com/share/opendmarc-cleanup-off-by-one.html |
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| 사용자 | WeitongLi (UID 100239) |
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| 제출 | 2026. 08. 06. AM 10:22 (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 | 410884 [Trusted Domain Project OpenDMARC 까지 1.4.2 DMARC Record Parser opendmarc_util.c opendmarc_util_cleanup 메모리 손상] |
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| 포인트들 | 20 |
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