medium
5.3
CWE
203
Advisory Published
Advisory Published
Updated

CVE-2020-26939

First published: Mon Nov 02 2020(Updated: )

In Legion of the Bouncy Castle BC before 1.55 and BC-FJA before 1.0.2, attackers can obtain sensitive information about a private exponent because of Observable Differences in Behavior to Error Inputs. This occurs in org.bouncycastle.crypto.encodings.OAEPEncoding. Sending invalid ciphertext that decrypts to a short payload in the OAEP Decoder could result in the throwing of an early exception, potentially leaking some information about the private exponent of the RSA private key performing the encryption.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Bouncycastle Legion-of-the-bouncy-castle<1.61
Bouncycastle Legion-of-the-bouncy-castle-fips-java-api<1.0.1.2
maven/org.bouncycastle:bcprov-jdk15to18<1.61
1.61
maven/org.bouncycastle:bcprov-jdk15on<1.61
1.61
maven/org.bouncycastle:bcprov-ext-jdk16<1.61
1.61
maven/org.bouncycastle:bcprov-ext-jdk15on<1.61
1.61
maven/org.bouncycastle:bc-fips<1.0.2
1.0.2
maven/org.bouncycastle:bcprov-jdk16<1.61
1.61
maven/org.bouncycastle:bcprov-jdk14<1.61
1.61

Remedy

https://github.com/bcgit/bc-java/wiki/CVE-2020-26939

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-26939?

    The severity of CVE-2020-26939 is medium with a severity value of 5.3.

  • How can an attacker exploit CVE-2020-26939?

    An attacker can exploit CVE-2020-26939 by sending invalid ciphertext to obtain sensitive information about a private exponent.

  • Which software versions are affected by CVE-2020-26939?

    Legion of the Bouncy Castle BC versions before 1.61 and BC-FJA versions before 1.0.1.2 are affected by CVE-2020-26939.

  • Is there a fix available for CVE-2020-26939?

    Yes, you can refer to the references provided for information on how to fix CVE-2020-26939.

  • What is the Common Weakness Enumeration (CWE) ID for CVE-2020-26939?

    The CWE ID for CVE-2020-26939 is 203.

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