VDB-143357 · CVE-2019-17455 · DLA 2207-1

Libntlm up to 1.5 smbutil.c buffer overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.5	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Libntlm up to 1.5. Impacted is the function tSmbNtlmAuthRequest/tSmbNtlmAuthChallenge/tSmbNtlmAuthResponse of the file smbutil.c. The manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2019-17455. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Libntlm up to 1.5 and classified as critical. This issue affects the function tSmbNtlmAuthRequest/tSmbNtlmAuthChallenge/tSmbNtlmAuthResponse of the file smbutil.c. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed 10/10/2019 (Website). The advisory is shared at lists.debian.org. The identification of this vulnerability is CVE-2019-17455 since 10/10/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

Libntlm

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/10/2019 🔍
10/10/2019 +0 days 🔍
10/11/2019 +1 days 🔍
01/08/2024 +1550 days 🔍

Sourcesinfo

Advisory: DLA 2207-1
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-17455 (🔍)
GCVE (CVE): GCVE-0-2019-17455
GCVE (VulDB): GCVE-100-143357

Entryinfo

Created: 10/11/2019 09:46
Updated: 01/08/2024 07:13
Changes: 10/11/2019 09:46 (53), 10/01/2020 12:45 (2), 01/08/2024 07:13 (3)
Complete: 🔍
Cache ID: 216::103