Date: Tue, 17 Sep 2019 18:54:53 +0200 From: Salvatore Bonaccorso <carnil@...ian.org> To: oss-security@...ts.openwall.com Subject: Re: OpenDMARC signature bypass with multiple From addresses Hi, On Wed, Sep 11, 2019 at 12:43:19PM +0200, Hanno Böck wrote: > Hi, > > Protonmail reported about a phishing incident in July: > https://protonmail.com/blog/bellingcat-cyberattack-phishing/ > > This had this somewhat mysterious chapter: > "Furthermore, the attackers attempted to exploit an unpatched > vulnerability in an open source software that is widely used by email > providers in an effort to bypass spam and abuse filters. We were > previously aware of this vulnerability and have already been watching > it for some time, but we will not disclose it here because the software > in question is not developed by ProtonMail, and it has not yet been > patched by the software maintainers. This vulnerability, however, is > not widely known and indicates a higher level of sophistication on the > part of the attackers." > > After asking protonmail multiple times for a statement they answered > and I learned that it's about this issue in OpenDMARC: > https://github.com/trusteddomainproject/OpenDMARC/pull/48 > > It's an issue where by specifying multiple From addresses only one of > them gets DMARC-checked. > > There's no reaction from the OpenDMARC developers and it's unclear > whether it's still actively developed. Given this is already actively > exploited I think people should be aware of it and distros should > probably apply the patch from the PR. MITRE has assigned CVE-2019-16378 for this issue (requested via the https://cveform.mitre.org/). Regards, Salvatore
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