Vulnerability Monitor

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CVE-2019-19906

cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, 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 and availability (service disruption) for affected systems. Impacting 20 products from cyrusimap, from debian, from canonical and 17 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

2019-12-19T18:15:12.833

Last Modified

2024-11-21T04:35:37.960

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

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

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

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-193
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cyrusimap	cyrus-sasl	< 2.1.28	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	debian	debian_linux	10.0	Yes
Operating System	canonical	ubuntu_linux	12.04	Yes
Operating System	canonical	ubuntu_linux	14.04	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes
Operating System	canonical	ubuntu_linux	19.10	Yes
Operating System	fedoraproject	fedora	31	Yes
Operating System	fedoraproject	fedora	32	Yes
Application	redhat	jboss_enterprise_web_server	2.0.0	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	redhat	enterprise_linux	5.0	Yes
Operating System	redhat	enterprise_linux	6.0	Yes
Operating System	redhat	enterprise_linux	7.0	Yes
Operating System	redhat	enterprise_linux	8.0	Yes
Operating System	redhat	enterprise_linux_eus	8.4	Yes
Operating System	redhat	enterprise_linux_for_ibm_z_systems	8.0	Yes
Operating System	redhat	enterprise_linux_for_ibm_z_systems_eus	8.4	Yes
Operating System	redhat	enterprise_linux_for_power_little_endian	8.0	Yes
Operating System	redhat	enterprise_linux_for_power_little_endian_eus	8.4	Yes
Operating System	redhat	enterprise_linux_server_aus	8.4	Yes
Operating System	redhat	enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions	8.4	Yes
Operating System	redhat	enterprise_linux_server_tus	8.4	Yes
Operating System	redhat	enterprise_linux_server_update_services_for_sap_solutions	8.4	Yes
Operating System	apple	ipados	13.6	Yes
Operating System	apple	iphone_os	13.6	Yes
Operating System	apple	mac_os_x	< 10.13.6	Yes
Operating System	apple	mac_os_x	< 10.13.6	Yes
Operating System	apple	mac_os_x	< 10.15.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.13.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Operating System	apple	mac_os_x	10.14.6	Yes
Application	apache	bookkeeper	4.12.1	Yes
Operating System	centos	centos	7.0	No

References

http://seclists.org/fulldisclosure/2020/Jul/23 Mailing List, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Jul/24 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2022/02/23/4 Mailing List, Patch, Release Notes, Third Party Advisory ([email protected])
https://github.com/cyrusimap/cyrus-sasl/issues/587 Patch, Third Party Advisory ([email protected])
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E ([email protected])
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E ([email protected])
https://lists.debian.org/debian-lts-announce/2019/12/msg00027.html Mailing List, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MW6GZCLECGL2PBNHVNPJIX4RPVRVFR7R/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OB4GSVOJ6ESHQNT5GSV63OX5D4KPSTGT/ ([email protected])
https://seclists.org/bugtraq/2019/Dec/42 Mailing List, Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211288 Third Party Advisory ([email protected])
https://support.apple.com/kb/HT211289 Third Party Advisory ([email protected])
https://usn.ubuntu.com/4256-1/ Patch, Third Party Advisory ([email protected])
https://www.debian.org/security/2019/dsa-4591 Third Party Advisory ([email protected])
https://www.openldap.org/its/index.cgi/Incoming?id=9123 Exploit, Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Jul/23 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2020/Jul/24 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2022/02/23/4 Mailing List, Patch, Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/cyrusimap/cyrus-sasl/issues/587 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E (af854a3a-2127-422b-91ae-364da2661108)
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2019/12/msg00027.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MW6GZCLECGL2PBNHVNPJIX4RPVRVFR7R/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OB4GSVOJ6ESHQNT5GSV63OX5D4KPSTGT/ (af854a3a-2127-422b-91ae-364da2661108)
https://seclists.org/bugtraq/2019/Dec/42 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211288 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/kb/HT211289 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4256-1/ Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2019/dsa-4591 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.openldap.org/its/index.cgi/Incoming?id=9123 Exploit, 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 cyrusimap'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.