GitHub Advisory DatabaseGHSA-Q3GH-5R98-J4H3RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.017 Low
EPSS
Percentile
87.7%
Impact
Jsrsasign can verify RSA-PSS signature which value can expressed as BigInteger. When there is a valid RSA-PSS signature value, this vulnerability is also accept value with prepending zeros as a valid signature.
- If you are not use RSA-PSS signature validation, this vulnerability is not affected.
- Risk to accept a forged or crafted message to be signed is low.
- Risk to raise memory corruption is low since jsrsasign uses BigInteger class.
Patches
Users using RSA-PSS signature validation should upgrade to 8.0.17.
Workarounds
Reject RSA-PSS signatures with unnecessary prepending zeros.
References
https://github.com/kjur/jsrsasign/security/advisories/GHSA-q3gh-5r98-j4h3
https://github.com/kjur/jsrsasign/issues/438
https://nvd.nist.gov/vuln/detail/CVE-2020-14968
https://vulners.com/cve/CVE-2020-14968
https://vuldb.com/?id.157125
https://kjur.github.io/jsrsasign/api/symbols/RSAKey.html#.verifyWithMessageHashPSS
Affected configurations
References
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14968
github.com/advisories/GHSA-q3gh-5r98-j4h3
github.com/kjur/jsrsasign/commit/3bcc088c727658d7235854cd2a409a904cc2ce99
github.com/kjur/jsrsasign/issues/438
github.com/kjur/jsrsasign/releases/tag/8.0.17
github.com/kjur/jsrsasign/releases/tag/8.0.18
github.com/kjur/jsrsasign/security/advisories/GHSA-q3gh-5r98-j4h3
kjur.github.io/jsrsasign/
kjur.github.io/jsrsasign/api/symbols/RSAKey.html#.verifyWithMessageHashPSS
nvd.nist.gov/vuln/detail/CVE-2020-14968
security.netapp.com/advisory/ntap-20200724-0001/
vuldb.com/?id.157125
www.npmjs.com/advisories/1541
www.npmjs.com/package/jsrsasign
Related
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.017 Low
EPSS
Percentile
87.7%