CVE-2019-17455 Information

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00029.html http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.html https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145 https://gitlab.com/jas/libntlm/issues/2 https://lists.debian.org/debian-lts-announce/2020/05/msg00010.html https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-17455.html https://security-tracker.debian.org/tracker/CVE-2019-17455

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8