Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nongnu | Libntlm | <= 1.5 |
| Debian | Debian Linux | 8.0 |
| Canonical | Ubuntu Linux | 14.04 |
| Fedoraproject | Fedora | 32 |
| Opensuse | Backports Sle | 15.0 |
| Opensuse | Leap | 15.1 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00029.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.htmlMailing ListThird Party Advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145ExploitIssue TrackingMailing List
- https://gitlab.com/jas/libntlm/issues/2ExploitThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00010.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00026.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- 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 ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.htmlMailing ListThird Party Advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145ExploitIssue TrackingMailing List
- https://gitlab.com/jas/libntlm/issues/2ExploitThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00010.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2019-17455?
CVE-2019-17455 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...
How severe is CVE-2019-17455?
CVE-2019-17455 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2019-17455?
Check the references section above for vendor advisories and patch information. Affected products include: Nongnu Libntlm, Debian Debian Linux, Canonical Ubuntu Linux, Fedoraproject Fedora, Opensuse Backports Sle.