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Observable Discrepancy


Severity Medium
Score 5.5/10


The "dsa_sign_setup" function in "crypto/dsa/dsa_ossl.c" in OpenSSL before 1.0.1u and 1.0.2 through 1.0.2h, does not properly ensure the use of constant-time operations, which makes it easier for local users to discover a DSA private key via a timing side-channel attack.

  • LOW
  • NONE
  • NONE
  • LOW
  • HIGH
  • NONE

CWE-203 - Observable Discrepancy

The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Advisory Timeline

  • Published