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GHSA-72m5-fvvv-55m6

Observable Differences in Behavior to Error Inputs in Bouncy Castle

Source: GitHub Advisory Database (reviewed) Moderate CVE-2020-26939

Packages

EcosystemPackageAffectedFixed in
Maven org.bouncycastle:bcprov-jdk14 < 1.61 1.61
Maven org.bouncycastle:bcprov-jdk15 < 1.61 1.61
Maven org.bouncycastle:bcprov-jdk16 < 1.61 1.61
Maven org.bouncycastle:bc-fips < 1.0.2 1.0.2
Maven org.bouncycastle:bcprov-ext-jdk15on < 1.61 1.61
Maven org.bouncycastle:bcprov-ext-jdk16 < 1.61 1.61
Maven org.bouncycastle:bcprov-jdk15on < 1.61 1.61
Maven org.bouncycastle:bcprov-jdk15to18 < 1.61 1.61

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.