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CVE-2018-5382— Bouncy Castle BKS-V1 keystore files vulnerable to trivial hash collisions

Quick assessment

Affected
Legion of the Bouncy Castle Bouncy Castle
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.

Bouncy Castle BC是Bouncy Castle组织的一个用于C＃和Java应用程序的加密库。 Bouncy Castle BKS-V1中存在加密问题漏洞，该漏洞源于Bouncy Castle BKS-V1文件所使用HMAC的长度仅为16位。攻击者可利用该漏洞绕过BKS完整性检测。

AI Predicted 7.5 Difficulty: Easy EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1562
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I. Basic Information for CVE-2018-5382

Vulnerability Information
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Vulnerability Title
Bouncy Castle BKS-V1 keystore files vulnerable to trivial hash collisions
Source: CVE Program / CVE List V5
Vulnerability Description
The default BKS keystore use an HMAC that is only 16 bits long, which can allow an attacker to compromise the integrity of a BKS keystore. Bouncy Castle release 1.47 changes the BKS format to a format which uses a 160 bit HMAC instead. This applies to any BKS keystore generated prior to BC 1.47. For situations where people need to create the files for legacy reasons a specific keystore type "BKS-V1" was introduced in 1.49. It should be noted that the use of "BKS-V1" is discouraged by the library authors and should only be used where it is otherwise safe to do so, as in where the use of a 16 bit checksum for the file integrity check is not going to cause a security issue in itself.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
Bouncy Castle BKS-V1 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bouncy Castle BC是Bouncy Castle组织的一个用于C＃和Java应用程序的加密库。 Bouncy Castle BKS-V1中存在加密问题漏洞，该漏洞源于Bouncy Castle BKS-V1文件所使用HMAC的长度仅为16位。攻击者可利用该漏洞绕过BKS完整性检测。
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
Legion of the Bouncy Castle Bouncy Castle all ~ 1.47 -

II. Public POCs for CVE-2018-5382

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III. Intelligence Information for CVE-2018-5382

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Vendor Advisories for CVE-2018-5382 (4)

Other References for CVE-2018-5382 (1)

IV. Related Vulnerabilities

Same vendor: Legion of the Bouncy Castle
Same weakness: CWE-327

V. Comments for CVE-2018-5382

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