Vulnerability Monitor

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CVE-2019-17455

Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.

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 6 products from nongnu, from debian, from canonical and 3 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

2019-10-10T18:15:11.647

Last Modified

2024-11-21T04:32:21.390

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-125

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	nongnu	libntlm	≤ 1.5	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	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	20.04	Yes
Operating System	fedoraproject	fedora	32	Yes
Operating System	fedoraproject	fedora	33	Yes
Application	opensuse	backports_sle	15.0	Yes
Operating System	opensuse	leap	15.1	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00029.html Mailing List, Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.html Mailing List, Third Party Advisory ([email protected])
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145 Exploit, Issue Tracking, Mailing List, Third Party Advisory ([email protected])
https://gitlab.com/jas/libntlm/issues/2 Exploit, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2020/05/msg00010.html Mailing List, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2021/11/msg00026.html Mailing List, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BVFO3OVJPMSGIXBKNOCVOJZ3UTGZQF5/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YZ5YWYNOJ5HMCKAHWLTY4MXZQWJJCBI7/ ([email protected])
https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-17455.html Third Party Advisory ([email protected])
https://security-tracker.debian.org/tracker/CVE-2019-17455 Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00029.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145 Exploit, Issue Tracking, Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://gitlab.com/jas/libntlm/issues/2 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2020/05/msg00010.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2021/11/msg00026.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BVFO3OVJPMSGIXBKNOCVOJZ3UTGZQF5/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YZ5YWYNOJ5HMCKAHWLTY4MXZQWJJCBI7/ (af854a3a-2127-422b-91ae-364da2661108)
https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-17455.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security-tracker.debian.org/tracker/CVE-2019-17455 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 nongnu'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.