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Bug 807619 (CVE-2021-38371) - mail-mta/exim: STARTTLS response injection (buffering) (CVE-2021-38371)
Summary: mail-mta/exim: STARTTLS response injection (buffering) (CVE-2021-38371)
Alias: CVE-2021-38371
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B4 [upstream]
Depends on:
Blocks: 807352
  Show dependency tree
Reported: 2021-08-10 20:37 UTC by John Helmert III
Modified: 2022-02-18 07:35 UTC (History)
3 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2021-08-10 20:37:59 UTC

The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.

The CVE references this, but it 404s for me:
Comment 1 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2022-02-18 04:43:59 UTC
@hanno: do you know if there's any news on this?
Comment 2 Hanno Böck gentoo-dev 2022-02-18 07:35:56 UTC
No, except that we recently got a request to re-check this and could confirm that it was still present in exim 4.95.

I have to say during our research this wasn't a main focus of us. We mostly looked into mail client to server communication and kinda looked on the server to server part only briefly as we already had the tools ready. We reported issues, but didn't really follow up (also generally people have less expectation of s2s connections to be secure).