CVE-2020-8904— Arbitrary trusted memory overwrite vulnerability in Asylo
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。 Asylo 0.6.0之前版本中的可信内存存在缓冲区错误漏洞，该漏洞源于‘ecall_restore’函数没有验证output_len指针的范围。攻击者可通过操纵tmp_output_len值利用该漏洞向可信内存的任意位置进行写入操作。
Possible ATT&CK Techniques 2 AI
T1203 · Exploitation for Client Execution T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2020-8904
Vulnerability Information
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Vulnerability Title
Arbitrary trusted memory overwrite vulnerability in Asylo
Source: CVE Program / CVE List V5
Vulnerability Description
An arbitrary memory overwrite vulnerability in the trusted memory of Asylo exists in versions prior to 0.6.0. As the ecall_restore function fails to validate the range of the output_len pointer, an attacker can manipulate the tmp_output_len value and write to an arbitrary location in the trusted (enclave) memory. We recommend updating Asylo to version 0.6.0 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用越界的指针偏移
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。 Asylo 0.6.0之前版本中的可信内存存在缓冲区错误漏洞，该漏洞源于‘ecall_restore’函数没有验证output_len指针的范围。攻击者可通过操纵tmp_output_len值利用该漏洞向可信内存的任意位置进行写入操作。
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 | stable ~ 0.6.0 | - |
|
II. Public POCs for CVE-2020-8904
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2020-8904 (1)
-
https://github.com/google/asylo/commit/e582f36ac49ee11a21d23ad6a30c333092e0a94e x_refsource_CONFIRM
Same Patch Batch · Google LLC · 2020-08-12 · 3 CVEs total
| CVE-2020-8913 | 8.8 HIGH | Local arbitrary code execution in splitinstall in Android's Play Core |
| CVE-2020-8905 | 2.8 LOW | Confidential Information Disclosure vulnerability in Asylo |
IV. Related Vulnerabilities
Same product: Asylo
-
CVE-2021-22552
Memory overread secure enclave in Asylo 0.6.2 -
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CVE-2021-22548
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CVE-2020-8944
Unchecked buffer overrun in ecall_restore
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V. Comments for CVE-2020-8904
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