Arch Linux Security Advisory ASA-201905-6

Severity: Medium
Date : 2019-05-06
CVE-ID : CVE-2019-11494 CVE-2019-11499
Package : dovecot
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-954

Summary

The package dovecot before version 2.3.6-1 is vulnerable to denial of
service.

Resolution

Upgrade to 2.3.6-1.

pacman -Syu “dovecot>=2.3.6-1”

The problems have been fixed upstream in version 2.3.6.

Workaround

None.

Description

• CVE-2019-11494 (denial of service)

Submission-login crashes with signal 11 due to null pointer access when
authentication is aborted by disconnecting. This can lead to denial-of
service attack by persistent attacker(s).

• CVE-2019-11499 (denial of service)

Submission-login crashes when authentication is started over TLS
secured channel and invalid authentication message is sent. This can
lead to denial-of-service attack by persistent attacker(s).

Impact

A remote attacker is able to cause a denial of service by sending
invalid authentication messages or aborting the authentication process.

References

https://dovecot.org/doc/NEWS-2.3
https://www.mail-archive.com/[email protected]/msg06126.html
https://dovecot.org/pipermail/dovecot/2019-April/115757.html
https://dovecot.org/pipermail/dovecot/2019-April/115758.html
https://security.archlinux.org/CVE-2019-11494
https://security.archlinux.org/CVE-2019-11499