Information disclosure in Bouncy Castle for Java - CVE-2020-26939

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Main Vulnerability Database Vulnerabilities #VU48199

Information disclosure in Bouncy Castle for Java - CVE-2020-26939

Published: November 2, 2020 / Updated: November 8, 2020


Vulnerability identifier: #VU48199
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-26939
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to observable differences in behavior to error inputs within the org.bouncycastle.crypto.encodings.OAEPEncoding component in Legion of the Bouncy Castle BC. A remote attacker can obtain sensitive information about a private exponent by sending invalid ciphertext that decrypts to a short payload in the OAEP Decoder. This causes the application to throw an early exception, potentially leaking some information about the private exponent of the RSA private key performing the encryption.


Affected software

Bouncy Castle for Java
Dell Secure Connect Gateway
IBM Cloud Application Performance Management (APM)
IBM Maximo Application Suite
IBM Observability with Instana
IBM Sterling File Gateway

How to mitigate CVE-2020-26939

Install updates from vendor's website.

Bouncy Castle for Java - update to 1.61
Dell Secure Connect Gateway - update to 5.26.00.18
IBM Sterling File Gateway - addressed in versions 6.0.3.7, 6.1.0.5, 6.1.1.2, 6.1.2.0
IBM Cloud Application Performance Management (APM) - update to 8.1.4.0.14
IBM Maximo Application Suite - addressed in versions 8.10.18, 8.11.15, 9.0.3, 9.1.0
IBM Observability with Instana - update to 269

External References

Related Security Bulletins