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CVE-2019-17455

Published: 10 October 2019

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.

From the Ubuntu Security Team

It was discovered that Libntlm incorrectly handled specially crafted NTML requests. An attacker could possibly use this issue to cause a denial of service or another unspecified impact.

Notes

AuthorNote
ebarretto
No fix available as of 2019-12-04

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
libntlm
Launchpad, Ubuntu, Debian
bionic
Released (1.4-8ubuntu0.1)
disco Ignored
(reached end-of-life)
eoan Ignored
(reached end-of-life)
focal
Released (1.5-2ubuntu0.1)
groovy Not vulnerable
(1.6-1)
hirsute Not vulnerable
(1.6-1)
impish Not vulnerable
(1.6-1)
jammy Not vulnerable
(1.6-1)
precise Does not exist

trusty
Released (1.4-1ubuntu0.1~esm1)
upstream
Released (1.6)
xenial
Released (1.4-7ubuntu0.1~esm1)
Patches:
upstream: https://gitlab.com/jas/libntlm/-/commit/b967886873fcf19f816b9c0868465f2d9e5df85e

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H