Linux Kernel up to 4.10.15 inet_connection_sock.c inet_csk_clone_lock double 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 was found in Linux Kernel up to 4.10.15. It has been rated as critical. Impacted is the function inet_csk_clone_lock of the file net/ipv4/inet_connection_sock.c. Performing a manipulation results in double free. This vulnerability was named CVE-2017-8890. The attack needs to be approached locally. There is no available exploit. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 4.10.15 (Operating System). This affects the function inet_csk_clone_lock of the file net/ipv4/inet_connection_sock.c. The manipulation with an unknown input leads to a double free vulnerability. CWE is classifying the issue as CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. This is going to have an impact on availability. The summary by CVE is:

The inet_csk_clone_lock function in net/ipv4/inet_connection_sock.c in the Linux kernel through 4.10.15 allows attackers to cause a denial of service (double free) or possibly have unspecified other impact by leveraging use of the accept system call.

The bug was discovered 05/10/2017. The weakness was presented 05/10/2017 as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2017-8890 since 05/10/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 100435 (Fedora 25 : kernel (2017-273b67d5ee)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371738 (F5 BIG-IP ASM,LTM,APM Linux kernel vulnerability(K02236463)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100435) and SecurityFocus (BID 98562†). See VDB-101471, VDB-101503, VDB-101504 and VDB-101505 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 100435
Nessus Name: Fedora 25 : kernel (2017-273b67d5ee)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for kernel FEDORA-2017-85744f8aa9
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: git.kernel.org

Timelineinfo

05/10/2017 🔍
05/10/2017 +0 days 🔍
05/10/2017 +0 days 🔍
05/10/2017 +0 days 🔍
05/10/2017 +0 days 🔍
05/11/2017 +1 days 🔍
05/25/2017 +14 days 🔍
05/26/2017 +1 days 🔍
12/06/2022 +2020 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2017-273b67d5ee
Researcher: syzkaller
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8890 (🔍)
GCVE (CVE): GCVE-0-2017-8890
GCVE (VulDB): GCVE-100-101073

OVAL: 🔍

SecurityFocus: 98562 - Linux Kernel CVE-2017-8890 Denial of Service Vulnerability
OSVDB: - CVE-2017-8890 - Linux - Double Free Issue

See also: 🔍

Entryinfo

Created: 05/11/2017 12:50
Updated: 12/06/2022 10:06
Changes: 05/11/2017 12:50 (81), 09/25/2020 11:42 (6), 12/23/2020 09:04 (3), 12/06/2022 10:03 (3), 12/06/2022 10:06 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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!