Linux Kernel up to 4.14.3 System Call net/dccp/proto.c dccp_disconnect 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.
6.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 4.14.3 and classified as critical. Affected is the function dccp_disconnect of the file net/dccp/proto.c of the component System Call Handler. This manipulation causes use after free. This vulnerability is tracked as CVE-2017-8824. The attack is restricted to local execution. Moreover, an exploit is present. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 4.14.3 (Operating System). Affected by this vulnerability is the function dccp_disconnect of the file net/dccp/proto.c of the component System Call Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The dccp_disconnect function in net/dccp/proto.c in the Linux kernel through 4.14.3 allows local users to gain privileges or cause a denial of service (use-after-free) via an AF_UNSPEC connect system call during the DCCP_LISTEN state.

The bug was discovered 05/07/2017. The weakness was disclosed 12/05/2017 by Mohamed Ghannam (Website). The advisory is shared at lists.openwall.net. This vulnerability is known as CVE-2017-8824 since 05/07/2017. An attack has to be approached locally. A single authentication is necessary for exploitation. Technical details and also a public exploit are known.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 212 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 105116 (Debian DLA-1200-1 : linux security update (KRACK)), 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 170614 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2017:3398-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (43234), Tenable (105116) and SecurityFocus (BID 102056†). The entries VDB-110249, VDB-110288, VDB-110317 and VDB-110475 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
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: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 105116
Nessus Name: Debian DLA-1200-1 : linux security update (KRACK)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 831051
OpenVAS Name: Fedora Update for kernel FEDORA-2017-129969aa8a
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

05/07/2017 🔍
05/07/2017 +0 days 🔍
12/05/2017 +212 days 🔍
12/05/2017 +0 days 🔍
12/05/2017 +0 days 🔍
12/05/2017 +0 days 🔍
12/10/2017 +5 days 🔍
12/11/2017 +1 days 🔍
12/21/2024 +2567 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2018:0399
Researcher: Mohamed Ghannam
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8824 (🔍)
GCVE (CVE): GCVE-0-2017-8824
GCVE (VulDB): GCVE-100-110197

OVAL: 🔍

SecurityFocus: 102056 - Linux Kernel CVE-2017-8824 Local Privilege Escalation Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 12/05/2017 17:48
Updated: 12/21/2024 03:57
Changes: 12/05/2017 17:48 (81), 12/12/2019 09:08 (10), 01/17/2023 08:06 (4), 12/21/2024 03:57 (16)
Complete: 🔍
Cache ID: 216::103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!