Linux Kernel up to 4.17.11 ucma.c ucma_leave_multicast use after free

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.
5.5$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel up to 4.17.11. This vulnerability affects the function ucma_leave_multicast of the file drivers/infiniband/core/ucma.c. Such manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2018-14734. Local access is required to approach this attack. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.17.11 (Operating System). Affected by this issue is the function ucma_leave_multicast of the file drivers/infiniband/core/ucma.c. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is availability. CVE summarizes:

drivers/infiniband/core/ucma.c in the Linux kernel through 4.17.11 allows ucma_leave_multicast to access a certain data structure after a cleanup step in ucma_process_join, which allows attackers to cause a denial of service (use-after-free).

The bug was discovered 06/04/2018. The weakness was disclosed 07/29/2018 (Website). The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2018-14734 since 07/29/2018. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 55 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111837 (SUSE SLES12 Security Update : kernel (SUSE-SU-2018:2374-1) (Foreshadow)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157830 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2018-4261)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (111837) and SecurityFocus (BID 104685†). The entries VDB-120483, VDB-120484, VDB-123038 and VDB-130428 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 111837
Nessus Name: SUSE SLES12 Security Update : kernel (SUSE-SU-2018:2374-1) (Foreshadow)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: git.kernel.org

Timelineinfo

06/04/2018 🔍
07/06/2018 +32 days 🔍
07/29/2018 +22 days 🔍
07/29/2018 +0 days 🔍
07/29/2018 +0 days 🔍
07/30/2018 +1 days 🔍
08/16/2018 +17 days 🔍
08/17/2018 +1 days 🔍
04/27/2023 +1714 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:0831
Status: Confirmed

CVE: CVE-2018-14734 (🔍)
GCVE (CVE): GCVE-0-2018-14734
GCVE (VulDB): GCVE-100-122312

OVAL: 🔍

SecurityFocus: 104685 - Linux Kernel 'drivers/video/fbdev/uvesafb.c' Local Integer Overflow Vulnerability

See also: 🔍

Entryinfo

Created: 07/30/2018 14:24
Updated: 04/27/2023 16:05
Changes: 07/30/2018 14:24 (77), 03/11/2020 08:51 (5), 04/27/2023 16:05 (5)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!