VDB-127099 · CVE-2018-19528 · GCVE-0-2018-19528

TP-LINK TL-WR886N 7.0 Tlb Loader DNS Packet memory corruption

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-$5k	0.00

Summaryinfo

A vulnerability was found in TP-LINK TL-WR886N 7.0. It has been rated as problematic. Impacted is an unknown function of the component Tlb Loader. This manipulation as part of DNS Packet causes memory corruption. The identification of this vulnerability is CVE-2018-19528. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to implement restrictive firewalling.

Detailsinfo

A vulnerability classified as problematic was found in TP-LINK TL-WR886N 7.0 (Router Operating System). Affected by this vulnerability is an unknown function of the component Tlb Loader. The manipulation as part of a DNS Packet leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. The summary by CVE is:

TP-Link TL-WR886N 7.0 1.1.0 devices allow remote attackers to cause a denial of service (Tlb Load Exception) via crafted DNS packets to port 53/udp.

The bug was discovered 11/22/2018. The weakness was shared 11/26/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2018-19528 since 11/25/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k.

Proper firewalling of udp/53 (dns) is able to address this issue.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Router Operating System

Vendor

TP-LINK

Name

TL-WR886N

Version

License

commercial

Website

Vendor: https://www.tp-link.com/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Firewalling: 🔍

Timelineinfo

11/22/2018 🔍
11/25/2018 +3 days 🔍
11/25/2018 +0 days 🔍
11/26/2018 +1 days 🔍
11/26/2018 +0 days 🔍
04/14/2020 +505 days 🔍

Sourcesinfo

Vendor: tp-link.com

Advisory: github.com
Status: Not defined

CVE: CVE-2018-19528 (🔍)
GCVE (CVE): GCVE-0-2018-19528
GCVE (VulDB): GCVE-100-127099

Entryinfo

Created: 11/26/2018 09:49
Updated: 04/14/2020 17:21
Changes: 11/26/2018 09:49 (60), 04/14/2020 17:21 (1)
Complete: 🔍
Cache ID: 216::103