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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTcybTUtZnZ2di01NW02

Observable Differences in Behavior to Error Inputs in Bouncy Castle

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.

Permalink: https://github.com/advisories/GHSA-72m5-fvvv-55m6
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTcybTUtZnZ2di01NW02
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 3 years ago
Updated: 10 months ago

CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Percentage: 0.00071
EPSS Percentile: 0.33011

Identifiers: GHSA-72m5-fvvv-55m6, CVE-2020-26939
References:

• https://nvd.nist.gov/vuln/detail/CVE-2020-26939
• https://github.com/bcgit/bc-java/commit/930f8b274c4f1f3a46e68b5441f1e7fadb57e8c1
• https://github.com/bcgit/bc-java/wiki/CVE-2020-26939
• https://lists.debian.org/debian-lts-announce/2020/11/msg00007.html
• https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e@%3Cissues.solr.apache.org%3E
• https://security.netapp.com/advisory/ntap-20201202-0005
• https://github.com/advisories/GHSA-72m5-fvvv-55m6

Repository: https://github.com/bcgit/bc-java
Blast Radius: 22.7

Affected Packages