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CVE-2020-4060— Use After Free in in cups_update_info in LoRa Basics Station

Quick assessment

Affected
LoRa Basics LoRa Basics Station
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LoRa Basics Station是一款LoRaWAN（长距离广域网）网关的实现。 Semtech LoRa Basics Station 2.0.4之前版本中存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。

CVSS 4.1 · Medium EPSS 0.95% · P58

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-4060

Vulnerability Information
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Vulnerability Title
Use After Free in in cups_update_info in LoRa Basics Station
Source: CVE Program / CVE List V5
Vulnerability Description
In LoRa Basics Station before 2.0.4, there is a Use After Free vulnerability that leads to memory corruption. This bug is triggered on 32-bit machines when the CUPS server responds with a message (https://doc.sm.tc/station/cupsproto.html#http-post-response) where the signature length is larger than 2 GByte (never happens in practice), or the response is crafted specifically to trigger this issue (i.e. the length signature field indicates a value larger than (2**31)-1 although the signature actually does not contain that much data). In such a scenario, on 32 bit machines, Basic Station would execute a code path, where a piece of memory is accessed after it has been freed, causing the process to crash and restarted again. The CUPS transaction is typically mutually authenticated over TLS. Therefore, in order to trigger this vulnerability, the attacker would have to gain access to the CUPS server first. If the user chose to operate without authentication over TLS but yet is concerned about this vulnerability, one possible workaround is to enable TLS authentication. This has been fixed in 2.0.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Semtech LoRa Basics Station 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LoRa Basics Station是一款LoRaWAN（长距离广域网）网关的实现。 Semtech LoRa Basics Station 2.0.4之前版本中存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LoRa Basics LoRa Basics Station < 2.0.4 -

II. Public POCs for CVE-2020-4060

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III. Intelligence Information for CVE-2020-4060

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Vendor Advisories for CVE-2020-4060 (1)

IV. Related Vulnerabilities

Same weakness: CWE-416

V. Comments for CVE-2020-4060

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