CVE-2020-7957: Input Validation
First published: Wed Feb 12 2020(Updated: )
The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Dovecot Dovecot | >=2.3.9<2.3.9.3 | |
| Fedoraproject Fedora | =30 | |
| Fedoraproject Fedora | =31 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2020/02/12/2
- https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html
- https://dovecot.org/security
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/
Frequently Asked Questions
What is CVE-2020-7957?
CVE-2020-7957 is a vulnerability in the IMAP and LMTP components in Dovecot versions 2.3.9 before 2.3.9.3 that allows a denial of service attack.
What is the severity of CVE-2020-7957?
The severity of CVE-2020-7957 is medium, with a severity value of 5.3.
How does CVE-2020-7957 affect Dovecot?
CVE-2020-7957 affects Dovecot versions 2.3.9 before 2.3.9.3, causing a denial of service that prevents recipients from reading all of their messages.
Which software versions are affected by CVE-2020-7957?
Dovecot versions 2.3.9 before 2.3.9.3 and Fedoraproject Fedora versions 30 and 31 are affected by CVE-2020-7957.
How can I fix the CVE-2020-7957 vulnerability?
To fix the CVE-2020-7957 vulnerability, update your Dovecot software to version 2.3.9.3 or higher.
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/weakness
- agent/references
- agent/author
- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/dovecot
- canonical/dovecot dovecot
- version/dovecot dovecot/2.3.9
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/30
- version/fedoraproject fedora/31