Tenda AC7/AC10/AC15/AC18 Web Server deviceList memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k0.00

A vulnerability was found in Tenda AC7, AC10, AC15 and AC18 (affected version unknown). It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Web Server. The manipulation of the argument deviceList as part of a POST Request 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 confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered on Tenda AC7 V15.03.06.44_CN, AC9 V15.03.05.19(6318)_CN, AC10 V15.03.06.23_CN, AC15 V15.03.05.19_CN, and AC18 V15.03.05.19(6318)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the 'deviceList' parameter for a post request, the value is directly used in a strcpy to a local variable placed on the stack, which overrides the return address of the function.

The bug was discovered 10/25/2018. The weakness was presented 10/28/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2018-18727 since 10/27/2018. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.9
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/25/2018 🔍
10/27/2018 +1 days 🔍
10/28/2018 +2 days 🔍
10/29/2018 +0 days 🔍
10/29/2018 +0 days 🔍
04/07/2020 +526 days 🔍

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2018-18727 (🔍)

Entryinfo

Created: 10/29/2018 16:04
Updated: 04/07/2020 09:46
Changes: 10/29/2018 16:04 (58), 04/07/2020 09:46 (1)
Complete: 🔍

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