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CVE-2020-8936— Arbitrary enclave memory overwrite vulnerability in ECall ecall_restore

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 存在缓冲区错误漏洞，该漏洞源于任意内存覆盖漏洞允许攻击者可利用该漏洞对UntrustedCall进行主机调用。UntrustedCall未能验证sgx参数内的缓冲区范围，并允许主机返回一个指针，该指针是enclave内存中的一个地址。这允许攻击者可利用该漏洞从enclave内读取内存值。

CVSS 5.3 · Medium EPSS 0.14% · P3
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I. Basic Information for CVE-2020-8936

Vulnerability Information
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Vulnerability Title
Arbitrary enclave memory overwrite vulnerability in ECall ecall_restore
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 UntrustedCall. UntrustedCall failed to validate the buffer range within sgx_params and allowed the host to return a pointer that was an address within the enclave memory. This allowed an attacker to read memory values from within the enclave.
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
跨界内存读
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 存在缓冲区错误漏洞，该漏洞源于任意内存覆盖漏洞允许攻击者可利用该漏洞对UntrustedCall进行主机调用。UntrustedCall未能验证sgx参数内的缓冲区范围，并允许主机返回一个指针，该指针是enclave内存中的一个地址。这允许攻击者可利用该漏洞从enclave内读取内存值。
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-2020-8936

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III. Intelligence Information for CVE-2020-8936

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Patches & Fixes for CVE-2020-8936 (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-2020-8937 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-2020-8942 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-125