CVE-2019-17455
CRITICALCVSS 9.8/10EPSS 3.11%
Last modified
CVE-2019-17455 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.11% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Nongnu | Libntlm | <= 1.5 | — |
| Debian | Debian Linux | 8.0 | — |
| Debian | Debian Linux | 9.0 | — |
| Canonical | Ubuntu Linux | 14.04 | — |
| Canonical | Ubuntu Linux | 16.04 | — |
| Canonical | Ubuntu Linux | 18.04 | — |
| Canonical | Ubuntu Linux | 20.04 | — |
| Fedoraproject | Fedora | 32 | — |
| Fedoraproject | Fedora | 33 | — |
| Opensuse | Backports Sle | 15.0 | Sp1 |
| Opensuse | Leap | 15.1 | — |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00029.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.htmlMailing List, Third Party Advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145Exploit, Issue Tracking, Mailing List, Third Party Advisory
- https://gitlab.com/jas/libntlm/issues/2Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00010.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00026.htmlMailing List, Third Party Advisory
- https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-17455.htmlThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2019-17455Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00029.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.htmlMailing List, Third Party Advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145Exploit, Issue Tracking, Mailing List, Third Party Advisory
- https://gitlab.com/jas/libntlm/issues/2Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00010.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00026.htmlMailing List, Third Party Advisory
- https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-17455.htmlThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2019-17455Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2019-17455?
CVE-2019-17455 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.11% probability of exploitation in the next 30 days.
How do I fix CVE-2019-17455?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-17455?
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Scan your code nowSource: NVD / NIST