CVE-2020-35679
First published: Thu Dec 24 2020(Updated: )
smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might allow attackers to trigger a "very significant" memory leak via messages to an instance that performs many regex lookups.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Opensmtpd Opensmtpd | <6.8.0 | |
| Opensmtpd Opensmtpd | =6.8.0 | |
| Opensmtpd Opensmtpd | =6.8.0-patch1-rc1 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 |
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Reference Links
- https://github.com/openbsd/src/commit/79a034b4aed29e965f45a13409268290c9910043
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
- https://poolp.org/posts/2020-12-24/december-2020-opensmtpd-6.8.0p1-released-fixed-several-bugs-proposed-several-diffs-book-is-on-github/
- https://security.gentoo.org/glsa/202105-12
- https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html
- https://www.mail-archive.com/misc%40opensmtpd.org/msg05188.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/
Frequently Asked Questions
What is CVE-2020-35679?
CVE-2020-35679 is a vulnerability in OpenSMTPD that allows attackers to trigger a significant memory leak through regex lookups.
How severe is CVE-2020-35679?
CVE-2020-35679 has a severity rating of 7.5 (high).
What software versions are affected by CVE-2020-35679?
OpenSMTPD versions up to and excluding 6.8.0 are affected by CVE-2020-35679.
How can I fix CVE-2020-35679?
To fix CVE-2020-35679, update to OpenSMTPD version 6.8.0p1 or later.
Where can I find more information about CVE-2020-35679?
You can find more information about CVE-2020-35679 in the references provided: [link 1](https://github.com/openbsd/src/commit/79a034b4aed29e965f45a13409268290c9910043), [link 2](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/), [link 3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/)
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- canonical/opensmtpd opensmtpd
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