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CVE-2018-16890

Published: 6 February 2019

libcurl versions from 7.36.0 to before 7.64.0 is vulnerable to a heap buffer out-of-bounds read. The function handling incoming NTLM type-2 messages (`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data correctly and is subject to an integer overflow vulnerability. Using that overflow, a malicious or broken NTLM server could trick libcurl to accept a bad length + offset combination that would lead to a buffer read out-of-bounds.

Notes

AuthorNote
mdeslaur
affects libcurl 7.36.0 to and including 7.63.0

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
upstream
Released (7.64.0)
trusty Not vulnerable
(code not present)
xenial
Released (7.47.0-1ubuntu2.12)
bionic
Released (7.58.0-2ubuntu3.6)
cosmic
Released (7.61.0-1ubuntu2.3)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H