Linux Kernel up to 4.4.1 kernel/ptrace.c access control ⚔ [Disputed]

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.
7.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel up to 4.4.1. The impacted element is an unknown function of the file kernel/ptrace.c. The manipulation results in access control. This vulnerability is reported as CVE-2015-8709. The attack requires a local approach. No exploit exists. The actual existence of this vulnerability is currently in question. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.4.1 (Operating System). Affected is an unknown functionality of the file kernel/ptrace.c. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

** DISPUTED ** kernel/ptrace.c in the Linux kernel through 4.4.1 mishandles uid and gid mappings, which allows local users to gain privileges by establishing a user namespace, waiting for a root process to enter that namespace with an unsafe uid or gid, and then using the ptrace system call. NOTE: the vendor states "there is no kernel bug here."

The weakness was disclosed 02/08/2016 by Jann Horn (Website). The advisory is available at lkml.org. The advisory contains:

The vendor states: "There is no kernel bug here."
This vulnerability is traded as CVE-2015-8709 since 12/31/2015. Local access is required to approach this attack. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The real existence of this vulnerability is still doubted at the moment. The vulnerability scanner Nessus provides a plugin with the ID 87741 (Debian DSA-3434-1 : linux - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350054 (Amazon Linux Security Advisory for kernel: ALAS-2016-648).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (87741) and SecurityFocus (BID 79899†). The entries VDB-79929 and VDB-80794 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CNA Base Score: 7.0
CNA Vector: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
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: 87741
Nessus Name: Debian DSA-3434-1 : linux - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703434
OpenVAS Name: Debian Security Advisory DSA 3434-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/17/2015 🔍
12/31/2015 +14 days 🔍
01/05/2016 +5 days 🔍
01/06/2016 +1 days 🔍
02/07/2016 +32 days 🔍
02/08/2016 +1 days 🔍
02/08/2016 +0 days 🔍
08/06/2024 +3102 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2016-5d43766e33
Researcher: Jann Horn
Status: Not defined
Confirmation: 🔍
Disputed: 🔍

CVE: CVE-2015-8709 (🔍)
GCVE (CVE): GCVE-0-2015-8709
GCVE (VulDB): GCVE-100-80802

OVAL: 🔍

SecurityFocus: 79899 - Linux Kernel 'kernel/ptrace.c' Local Privilege Escalation Vulnerability
SecurityTracker: 1034899

See also: 🔍

Entryinfo

Created: 02/08/2016 09:05
Updated: 08/06/2024 11:40
Changes: 02/08/2016 09:05 (60), 07/18/2018 09:40 (22), 07/07/2022 07:55 (4), 08/06/2024 11:40 (26)
Complete: 🔍
Cache ID: 216:9BE:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!