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CVE-2023-45287— Before Go 1.20, the RSA based key exchange methods in crypto/tls may exhibit a timing side channel

Quick assessment

Affected
Go standard library crypto/tls
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 Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go 1.20之前版本存在安全漏洞，该漏洞源于删除PKCS1填充会导致定时信息被泄露，攻击者可利用定时信息恢复会话密钥位。

AI Predicted 5.9 Difficulty: Hard EPSS 1.25% · P68

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2023-45287

Vulnerability Information
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Vulnerability Title
Before Go 1.20, the RSA based key exchange methods in crypto/tls may exhibit a timing side channel
Source: CVE Program / CVE List V5
Vulnerability Description
Before Go 1.20, the RSA based TLS key exchanges used the math/big library, which is not constant time. RSA blinding was applied to prevent timing attacks, but analysis shows this may not have been fully effective. In particular it appears as if the removal of PKCS#1 padding may leak timing information, which in turn could be used to recover session key bits. In Go 1.20, the crypto/tls library switched to a fully constant time RSA implementation, which we do not believe exhibits any timing side channels.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go 1.20之前版本存在安全漏洞，该漏洞源于删除PKCS1填充会导致定时信息被泄露，攻击者可利用定时信息恢复会话密钥位。
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
Go standard library crypto/tls 0 ~ 1.20.0 -

II. Public POCs for CVE-2023-45287

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III. Intelligence Information for CVE-2023-45287

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Vendor Advisories for CVE-2023-45287 (1)

Other References for CVE-2023-45287 (5)

IV. Related Vulnerabilities

Same product: crypto/tls
Same vendor: Go standard library

V. Comments for CVE-2023-45287

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