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CVE-2020-8937— Arbitrary enclave memory location write from untrusted environment

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 版本 0.6.0 及 0.6.0 之前版本中存在安全漏洞，该漏洞允许攻击者可利用该漏洞对enc不可信创建等待队列进行主机调用，该队列使用依赖于UntrustedLocalMemcpy的指针队列，该指针队列无法验证指针的位置。这允许攻击者可利用该漏洞从enclave内部写入内存值。

CVSS 5.3 · Medium EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2020-8937

Vulnerability Information
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Vulnerability Title
Arbitrary enclave memory location write from untrusted environment
Source: CVE Program / CVE List V5
Vulnerability Description
An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make a host call to enc_untrusted_create_wait_queue that uses a pointer queue that relies on UntrustedLocalMemcpy, which fails to validate where the pointer is located. This allows an attacker to write memory values from within the enclave. We recommend upgrading past commit a37fb6a0e7daf30134dbbf357c9a518a1026aa02
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 版本 0.6.0 及 0.6.0 之前版本中存在安全漏洞，该漏洞允许攻击者可利用该漏洞对enc不可信创建等待队列进行主机调用，该队列使用依赖于UntrustedLocalMemcpy的指针队列，该指针队列无法验证指针的位置。这允许攻击者可利用该漏洞从enclave内部写入内存值。
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 0.6.0 ~ 0.6.0 -

II. Public POCs for CVE-2020-8937

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III. Intelligence Information for CVE-2020-8937

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Patches & Fixes for CVE-2020-8937 (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-2020-8938 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-2020-8942 5.3 MEDIUM Unchecked buffer overrun in enc_untrusted_read
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