Vulnerability identifier: #VU18717

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11356

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cyrus IMAP Server
Server applications / Other server solutions

Vendor: Carnegie Mellon University

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
Install update from vendor's website.

Vulnerable software versions

Cyrus IMAP Server: 2.5.0 - 3.0.9

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External links
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IGO43JS7IFDNITHXOOHOP6JHRKRDIYY6/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PICSZDC3UGEUZ27VXGGM6OFI67D3KKLZ/
http://www.cyrusimap.org/imap/download/release-notes/2.5/index.html
http://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html
http://www.cyrusimap.org/imap/download/release-notes/3.0/index.html
http://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html
http://www.debian.org/security/2019/dsa-4458

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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.