Input validation error in Cyrus IMAP Server - CVE-2019-19783

Vulnerability identifier: #VU23774

CSH Severity: Medium

CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-19783

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to escalate privileges within the application.

The vulnerability exists due to insufficient validation of user-supplied input in autosieve_createfolder() function in imap/lmtp_sieve.c. A remote email user can create any mailbox with administrative privileges.

Successful exploitation of the vulnerability requires that the sieve script uploading is allowed (3.x) or certain non-default sieve options are enabled (2.x).

Cyrus IMAP Server
Gentoo Linux
Ubuntu
Fedora
cyrus-imapd (Debian package)
cyrus-admin (Ubuntu package)
cyrus-caldav (Ubuntu package)
cyrus-common (Ubuntu package)
cyrus-imapd (Ubuntu package)
cyrus-replication (Ubuntu package)
cyrus-imapd

Install updates from vendor's website.

Cyrus IMAP Server - addressed in versions 2.5.15, 3.0.13, 3.1.9
cyrus-imapd (Debian package) - addressed in versions 2.5.10-3+deb9u2, 3.0.8-6+deb10u3
cyrus-admin (Ubuntu package) - update to 2.5.10-3ubuntu1.1
cyrus-caldav (Ubuntu package) - update to 2.5.10-3ubuntu1.1
cyrus-common (Ubuntu package) - update to 2.5.10-3ubuntu1.1
cyrus-imapd (Ubuntu package) - update to 2.5.10-3ubuntu1.1
cyrus-replication (Ubuntu package) - update to 2.5.10-3ubuntu1.1
cyrus-imapd - addressed in versions 3.0.13-1.fc30, 3.0.13-1.fc31

• https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.15.html
• https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.13.html

• Privilege escalation in Cyrus IMAP
• Debian update for cyrus-imapd
• Gentoo update for Cyrus IMAP Server
• Ubuntu update for cyrus-imapd
• Fedora 31 update for cyrus-imapd
• Fedora 30 update for cyrus-imapd