Samba up to 4.4.9/4.5.5 smbd fd_open_atomic Symlink resource management

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Samba up to 4.4.9/4.5.5. This issue affects the function fd_open_atomic of the component smbd. The manipulation as part of Symlink leads to resource management. This vulnerability is traded as CVE-2017-9461. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Samba up to 4.4.9/4.5.5 (File Transfer Software) and classified as problematic. This issue affects the function fd_open_atomic of the component smbd. The manipulation as part of a Symlink leads to a resource management vulnerability. Using CWE to declare the problem leads to CWE-399. Impacted is availability. The summary by CVE is:

smbd in Samba before 4.4.10 and 4.5.x before 4.5.6 has a denial of service vulnerablity (fd_open_atomic infinite loop with high CPU usage and memory consumption) due to wrongly handling dangling symlinks.

The bug was discovered 02/09/2017. The weakness was shared 06/06/2017 (Website). The advisory is shared at bugs.debian.org. The identification of this vulnerability is CVE-2017-9461 since 06/06/2017. The exploitation is known to be easy. 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.

The vulnerability was handled as a non-public zero-day exploit for at least 117 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101262 (Ubuntu 14.04 LTS / 16.04 LTS / 16.10 / 17.04 : samba vulnerability (USN-3348-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176860 (Debian Security Update for samba (DLA 1754-1)).

Upgrading to version 4.4.10 or 4.5.6 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101262) and SecurityFocus (BID 99455†). The entry VDB-133154 is related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101262
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 16.10 / 17.04 : samba vulnerability (USN-3348-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103038
OpenVAS Name: Samba fd_open_atomic infinite loop Denial-of-Service Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Samba 4.4.10/4.5.6
Patch: 10c3e3923022485c720f322ca4f0aca5d7501310

Timelineinfo

02/09/2017 🔍
02/16/2017 +7 days 🔍
06/06/2017 +110 days 🔍
06/06/2017 +0 days 🔍
06/06/2017 +0 days 🔍
06/07/2017 +1 days 🔍
07/05/2017 +28 days 🔍
07/06/2017 +1 days 🔍
12/08/2022 +1981 days 🔍

Sourcesinfo

Product: samba.org

Advisory: USN-3348-1
Researcher: YOUZHONG YANG
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-9461 (🔍)
GCVE (CVE): GCVE-0-2017-9461
GCVE (VulDB): GCVE-100-102029
SecurityFocus: 99455 - Samba CVE-2017-9461 Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 06/07/2017 08:39
Updated: 12/08/2022 07:58
Changes: 06/07/2017 08:39 (79), 10/14/2019 09:39 (5), 12/26/2020 10:12 (3), 12/08/2022 07:52 (5), 12/08/2022 07:58 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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