#VU23774 Input validation error in Cyrus IMAP Server - CVE-2019-19783
Published: December 20, 2019
Vulnerability identifier: #VU23774
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2019-19783
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cyrus IMAP Server
Cyrus IMAP Server
Software vendor:
Carnegie Mellon University
Carnegie Mellon University
Description
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).
Remediation
Install updates from vendor's website.