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CVE-2020-8942— Unchecked buffer overrun in enc_untrusted_read

Quick assessment

Affected
Google LLC Asylo
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.

Google Asylo是美国Google公司的一个用于开发可信应用程序的框架。该软件支持创建一个可信任的执行环境，包括软件隔离和硬件隔离。 Google Asylo 0.6.0版本及之前版本存在安全漏洞，该漏洞允许不可信的攻击者可利用该漏洞调用不可信的enc读，其返回大小没有根据请求的大小进行验证。参数大小未检查，允许攻击者可利用该漏洞读取预期缓冲区大小之外的内存位置，包括安全enclave中的内存地址。

CVSS 5.3 · Medium EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2020-8942

Vulnerability Information
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Vulnerability Title
Unchecked buffer overrun in enc_untrusted_read
Source: CVE Program / CVE List V5
Vulnerability Description
An arbitrary memory read vulnerability in Asylo versions up to 0.6.0 allows an untrusted attacker to make a call to enc_untrusted_read whose return size was not validated against the requrested size. The parameter size is unchecked allowing the attacker to read memory locations outside of the intended buffer size including memory addresses within the secure enclave. We recommend upgrading past commit b1d120a2c7d7446d2cc58d517e20a1b184b82200
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Google Asylo 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Asylo是美国Google公司的一个用于开发可信应用程序的框架。该软件支持创建一个可信任的执行环境，包括软件隔离和硬件隔离。 Google Asylo 0.6.0版本及之前版本存在安全漏洞，该漏洞允许不可信的攻击者可利用该漏洞调用不可信的enc读，其返回大小没有根据请求的大小进行验证。参数大小未检查，允许攻击者可利用该漏洞读取预期缓冲区大小之外的内存位置，包括安全enclave中的内存地址。
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
Google LLC Asylo unspecified ~ 0.6.0 -

II. Public POCs for CVE-2020-8942

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III. Intelligence Information for CVE-2020-8942

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Patches & Fixes for CVE-2020-8942 (1)

Same Patch Batch · Google LLC · 2020-12-15 · 10 CVEs total

CVE-2020-8935 5.3 MEDIUM Google Asylo 缓冲区错误漏洞
CVE-2020-8936 5.3 MEDIUM Arbitrary enclave memory overwrite vulnerability in ECall ecall_restore
CVE-2020-8937 5.3 MEDIUM Arbitrary enclave memory location write from untrusted environment
CVE-2020-8938 5.3 MEDIUM Arbitrary enclave memory location write from untrusted environment
CVE-2020-8939 5.3 MEDIUM Out of Bounds read in Asylo
CVE-2020-8940 5.3 MEDIUM Unchecked buffer overrun in enc_untrusted_recvmsg
CVE-2020-8941 5.3 MEDIUM Unchecked buffer overrun in enc_untrusted_inet_pton
CVE-2020-8943 5.3 MEDIUM Unchecked buffer overrun in enc_untrusted_recvfrom
CVE-2020-8944 5.3 MEDIUM Unchecked buffer overrun in ecall_restore

IV. Related Vulnerabilities

Same product: Asylo
Same vendor: Google LLC
Same weakness: CWE-120

V. Comments for CVE-2020-8942

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