Vulnerability Monitor

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CVE-2019-11356

The CalDAV feature in httpd in Cyrus IMAP 2.5.x through 2.5.12 and 3.0.x through 3.0.9 allows remote attackers to execute arbitrary code via a crafted HTTP PUT operation for an event with a long iCalendar property name.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 8 products from cyrus, from fedoraproject, from debian and 5 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-06-03T20:29:00.297

Last Modified

2024-11-21T04:20:56.173

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cyrus	imap	≤ 2.5.12	Yes
Application	cyrus	imap	≤ 3.0.9	Yes
Operating System	fedoraproject	fedora	29	Yes
Operating System	fedoraproject	fedora	30	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes
Operating System	redhat	enterprise_linux	8.0	Yes
Operating System	redhat	enterprise_linux_eus	8.1	Yes
Operating System	redhat	enterprise_linux_eus	8.2	Yes
Operating System	redhat	enterprise_linux_eus	8.4	Yes
Operating System	redhat	enterprise_linux_server_aus	8.2	Yes
Operating System	redhat	enterprise_linux_server_aus	8.4	Yes
Operating System	redhat	enterprise_linux_server_tus	8.2	Yes
Operating System	redhat	enterprise_linux_server_tus	8.4	Yes

References

https://access.redhat.com/errata/RHSA-2019:1771 Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGO43JS7IFDNITHXOOHOP6JHRKRDIYY6/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PICSZDC3UGEUZ27VXGGM6OFI67D3KKLZ/ ([email protected])
https://seclists.org/bugtraq/2019/Jun/9 Mailing List, Third Party Advisory ([email protected])
https://usn.ubuntu.com/4566-1/ Third Party Advisory ([email protected])
https://www.cyrusimap.org/imap/download/release-notes/2.5/index.html Release Notes, Vendor Advisory ([email protected])
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html Release Notes, Vendor Advisory ([email protected])
https://www.cyrusimap.org/imap/download/release-notes/3.0/index.html Release Notes, Vendor Advisory ([email protected])
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html Release Notes, Vendor Advisory ([email protected])
https://www.debian.org/security/2019/dsa-4458 Third Party Advisory ([email protected])
https://access.redhat.com/errata/RHSA-2019:1771 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGO43JS7IFDNITHXOOHOP6JHRKRDIYY6/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PICSZDC3UGEUZ27VXGGM6OFI67D3KKLZ/ (af854a3a-2127-422b-91ae-364da2661108)
https://seclists.org/bugtraq/2019/Jun/9 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4566-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.cyrusimap.org/imap/download/release-notes/2.5/index.html Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.cyrusimap.org/imap/download/release-notes/3.0/index.html Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2019/dsa-4458 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cyrus's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.