| 标题 | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authentication |
|---|
| 描述 | OpenDMARC 1.4.2 fails to normalize certain Unicode characters in the domain of the visible `From:` address before performing a DMARC policy lookup. A crafted domain containing a Unicode character that maps to an ASCII domain separator, such as a fullwidth full stop, may therefore be treated as a different and policy-less domain. OpenDMARC returns `dmarc=none` instead of applying the DMARC policy published for the corresponding ASCII domain.
A remote unauthenticated attacker can exploit this issue by sending a forged message whose `From:` domain visually resembles a protected domain but uses such a Unicode character. No signing key or control of the victim’s DNS records is required. As a result, a published `p=reject` or `p=quarantine` policy may be bypassed, increasing the risk of email impersonation and phishing. |
|---|
| 来源 | ⚠️ https://weitongli.com/share/opendmarc-unicode-dot-bypass.html |
|---|
| 用户 | WeitongLi (UID 100239) |
|---|
| 提交 | 2026-08-06 12時53分 (2 月前) |
|---|
| 管理 | 2026-09-27 13時33分 (2 months later) |
|---|
| 状态 | 已接受 |
|---|
| VulDB条目 | 410885 [Trusted Domain Project OpenDMARC 直到 1.4.2 policy.c 远程代码执行] |
|---|
| 积分 | 20 |
|---|