Linux Kernel up to 4.10.1 drivers/tty/n_hdlc.c double free

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 4.10.1. This affects an unknown function of the file drivers/tty/n_hdlc.c. Such manipulation leads to double free. This vulnerability is uniquely identified as CVE-2017-2636. Local access is required to approach this attack. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.10.1 (Operating System). It has been rated as problematic. Affected by this issue is an unknown function of the file drivers/tty/n_hdlc.c. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is availability. CVE summarizes:

Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a denial of service (double free) by setting the HDLC line discipline.

The bug was discovered 03/02/2017. The weakness was disclosed 03/07/2017 by Alex (oss-sec). The advisory is available at openwall.com. This vulnerability is handled as CVE-2017-2636 since 12/01/2016. Local access is required to approach this attack. The successful exploitation requires a simple authentication. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 97640 (Debian DLA-849-1 : 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 276524 (Fedora Security Update for kernel (FEDORA-2017-387ff46a66)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (97640), SecurityFocus (BID 96732†) and SecurityTracker (ID 1037963†). The entries VDB-97226, VDB-97281, VDB-97445 and VDB-97446 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

Video

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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

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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: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 97640
Nessus Name: Debian DLA-849-1 : linux security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703804
OpenVAS Name: Debian Security Advisory DSA 3804-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Timelineinfo

12/01/2016 🔍
03/02/2017 +91 days 🔍
03/07/2017 +5 days 🔍
03/07/2017 +0 days 🔍
03/07/2017 +0 days 🔍
03/07/2017 +0 days 🔍
03/08/2017 +1 days 🔍
03/09/2017 +1 days 🔍
03/10/2017 +1 days 🔍
09/04/2020 +1274 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: openwall.com
Researcher: Alex
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-2636 (🔍)
GCVE (CVE): GCVE-0-2017-2636
GCVE (VulDB): GCVE-100-97622

OVAL: 🔍

SecurityFocus: 96732 - Linux Kernel CVE-2017-2636 Local Privilege Escalation Vulnerability
OSVDB: - CVE-2017-2636 - Linux - Double Free Issue
SecurityTracker: 1037963

See also: 🔍

Entryinfo

Created: 03/08/2017 08:17
Updated: 09/04/2020 16:56
Changes: 03/08/2017 08:17 (83), 09/04/2020 16:56 (7)
Complete: 🔍
Cache ID: 216:3D8:103

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