Linux Kernel up to 4.14.10 Pseudo Terminal drivers/tty/n_tty.c type conversion
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
3.2 | $0-$5k | 0.00 |
A vulnerability was found in Linux Kernel up to 4.14.10 (Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown part of the file drivers/tty/n_tty.c of the component Pseudo Terminal. The manipulation with an unknown input leads to a type conversion vulnerability. The CWE definition for the vulnerability is CWE-704. The product does not correctly convert an object, resource, or structure from one type to a different type. As an impact it is known to affect availability. The summary by CVE is:
drivers/tty/n_tty.c in the Linux kernel before 4.14.11 allows local attackers (who are able to access pseudo terminals) to hang/block further usage of any pseudo terminal devices due to an EXTPROC versus ICANON confusion in TIOCINQ.
The bug was discovered 12/21/2017. The weakness was disclosed 10/17/2018 (Website). The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2018-18386 since 10/16/2018. An attack has to be approached locally. A single authentication is necessary for exploitation. Technical details are known, but no exploit is available.
The vulnerability was handled as a non-public zero-day exploit for at least 300 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118952 (SUSE SLES11 Security Update : kernel (SUSE-SU-2018:3746-1)), 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 171709 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2018:3746-1)).
Upgrading to version 4.14.11 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.
The vulnerability is also documented in the vulnerability database at Tenable (118952). The entries 99009, 109136, 110475 and 114233 are pretty similar.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
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CVSSv3
VulDB Meta Base Score: 3.3VulDB Meta Temp Score: 3.2
VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 3.3
NVD Vector: 🔍
CVSSv2
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VulDB Base Score: 🔍
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Exploiting
Class: Type conversionCWE: CWE-704
ATT&CK: Unknown
Local: Yes
Remote: No
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Nessus ID: 118952
Nessus Name: SUSE SLES11 Security Update : kernel (SUSE-SU-2018:3746-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: Kernel 4.14.11
Patch: git.kernel.org
Timeline
12/21/2017 🔍03/08/2018 🔍
10/16/2018 🔍
10/17/2018 🔍
10/17/2018 🔍
10/18/2018 🔍
11/13/2018 🔍
11/14/2018 🔍
05/30/2023 🔍
Sources
Vendor: kernel.orgAdvisory: RHSA-2019:0831
Status: Confirmed
CVE: CVE-2018-18386 (🔍)
SecurityFocus: 103348 - Linux Kernel 'drivers/scsi/libsas/sas_expander.c' Local Denial of Service Vulnerability
See also: 🔍
Entry
Created: 10/18/2018 06:45Updated: 05/30/2023 09:28
Changes: 10/18/2018 06:45 (78), 04/05/2020 10:43 (4), 05/30/2023 09:28 (4)
Complete: 🔍
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