Signature Bypass

Affecting jsrsasign package, versions <8.0.18

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Overview

jsrsasign is a free pure JavaScript cryptographic library.

Affected versions of this package are vulnerable to Signature Bypass. It allows a malleability in ECDSA signatures by not checking overflows in the length of a sequence and '0' characters appended or prepended to an integer. The modified signatures are verified as valid. This could have a security-relevant impact if an application relied on a single canonical signature.

Remediation

Upgrade jsrsasign to version 8.0.18 or higher.

References

CVSS Score

3.7
low severity
  • Attack Vector
    Network
  • Attack Complexity
    High
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    Low
  • Integrity
    None
  • Availability
    None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Credit
Antonio de la Piedra
CVE
CVE-2020-14966
CWE
CWE-639
Snyk ID
SNYK-JS-JSRSASIGN-572936
Disclosed
22 Jun, 2020
Published
22 Jun, 2020