Ubuntu update for cyrus-imapd

1) Buffer overflow

EUVDB-ID: #VU18717

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11356

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in a crafted HTTP PUT operation for an event with a long iCalendar property name. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected package cyrus-imapd to the latest version.

Vulnerable software versions

Ubuntu: 18.04

cyrus-replication (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-imapd (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-common (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-caldav (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-admin (Ubuntu package): before 2.5.10-3ubuntu1.1

CPE2.3

• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:cyrus-replication_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-imapd_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-common_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-caldav_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-admin_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4566-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Input validation error

EUVDB-ID: #VU23774

Risk: Medium

CVSSv4.0: 1.3 [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/E:U/U:Green]

CVE-ID: CVE-2019-19783

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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).

Mitigation

Update the affected package cyrus-imapd to the latest version.

Vulnerable software versions

Ubuntu: 18.04

cyrus-replication (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-imapd (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-common (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-caldav (Ubuntu package): before 2.5.10-3ubuntu1.1

cyrus-admin (Ubuntu package): before 2.5.10-3ubuntu1.1

CPE2.3

• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:cyrus-replication_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-imapd_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-common_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-caldav_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:cyrus-admin_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4566-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.