Vulnerability Monitor

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CVE-2019-18934

Unbound 1.6.4 through 1.9.4 contain a vulnerability in the ipsec module that can cause shell code execution after receiving a specially crafted answer. This issue can only be triggered if unbound was compiled with `--enable-ipsecmod` support, and ipsecmod is enabled and used in the configuration.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.3, 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 limited data confidentiality, limited integrity, and limited availability for affected systems. Impacting 3 products from nlnetlabs, from fedoraproject, from opensuse 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

2019-11-19T18:15:10.523

Last Modified

2024-11-21T04:33:52.093

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.3 (HIGH)

CVSSv2 Vector

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

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

Exploitability Score

8.6

Impact Score

6.4

Weaknesses

Type: Primary
CWE-78

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	nlnetlabs	unbound	≤ 1.9.4	Yes
Operating System	fedoraproject	fedora	31	Yes
Operating System	opensuse	leap	15.1	Yes
Operating System	opensuse	leap	15.2	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.html Mailing List, Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.html Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2019/11/19/1 Exploit, Mailing List, Third Party Advisory ([email protected])
https://github.com/NLnetLabs/unbound/blob/release-1.9.5/doc/Changelog Release Notes ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MOCR6JP7MSRARTOGEHGST64G4FJGX5VK/ ([email protected])
https://www.nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txt Patch, Vendor Advisory ([email protected])
https://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/ Release Notes, Vendor Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2019/11/19/1 Exploit, Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/NLnetLabs/unbound/blob/release-1.9.5/doc/Changelog Release Notes (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MOCR6JP7MSRARTOGEHGST64G4FJGX5VK/ (af854a3a-2127-422b-91ae-364da2661108)
https://www.nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txt Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/ Release Notes, Vendor 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 nlnetlabs'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.