SB2020021231 - Infinite loop in dovecot (Alpine package)
Published: February 12, 2020
Security Bulletin ID
SB2020021231
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Infinite loop (CVE-ID: CVE-2020-7046)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop in lib-smtp in submission-login and lmtp and processing truncated UTF-8 data in command parameters. A remote non-authenticated attacker can send specially crafted command to the dovecot server and consume all available system resources and perform a denial of service attack.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=4188e3f4c8c70ca30f481278b85d52799ade266a
- https://git.alpinelinux.org/aports/commit/?id=63c2cc277e73718a89df156cafffdaaf5bbad6cc
- https://git.alpinelinux.org/aports/commit/?id=e9ada9531d3f3e60456ec07437a2f39f9a196861
- https://git.alpinelinux.org/aports/commit/?id=e4e11f810f4cc92a5571af410212a5017a22c38f
- https://git.alpinelinux.org/aports/commit/?id=e9e7886ac4e95e89ba3699315dffc40c61159838