GHSA-g753-jx37-7xwh
ECDSA signature vulnerability of Minerva timing attack in jsrsasign
GHSA-g753-jx37-7xwh is a medium vulnerability (CVSS 5.9) in jsrsasign, published June 30, 2020. No source lists public exploit code. Fixed in jsrsasign 8.0.13.
- Severity
- 5.9 MediumCVSS 3.1, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
8.0.13jsrsasign
Description
Impact
ECDSA side-channel attack named Minerava have been found and it was found that it affects to jsrsasign.
Execution time of thousands signature generation have been observed then EC private key which is scalar value may be recovered since point and scalar multiplication time depends on bits of scalar. In jsrsasign 8.0.13 or later, execution time of EC point and scalar multiplication is almost constant and fixed for the issue.
- Minerva is one of timing attack or side channel attack for EC.
- If you don't use ECDSA class, you are not affected the vulnerability.
- The vulnerability is that attacker may guess private key by checking processing time of EC key generation or ECDSA signing.
- The cause issue is that point multiplication processing time in ECDSA signing is depends on private key value.
- After 8.0.13, processing time of point multiplication in ECDSA signing have become constant for key value in theory.
Patches
Users using ECDSA signature generation should upgrade to 8.0.13 or later.
Workarounds
There is no workarounds in jsrsasign. Update jsrsasign or use other ECDSA library.
ACKNOWLEDGEMENT
Thanks to Jan Jancar @J08nY, Petr Svenda and Vladimir Sedlacek of Masaryk University in Czech Republic to find and report this vulnerability.
References
https://minerva.crocs.fi.muni.cz/ https://www.npmjs.com/advisories/1505 https://github.com/kjur/jsrsasign/issues/411
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- High
- Availability
- None
Affected packages
| Package | Affected | Fixed |
|---|---|---|
jsrsasignnpm | 4.0.0 up to 8.0.13 | 8.0.13 |
What each source reports
GitHub Advisories Score used
ECDSA signature vulnerability of Minerva timing attack in jsrsasign
Impact
ECDSA side-channel attack named Minerava have been found and it was found that it affects to jsrsasign.
Execution time of thousands signature generation have been observed then EC private key which is scalar value may be recovered since point and scalar multiplication time depends on bits of scalar. In jsrsasign 8.0.13 or later, execution time of EC point and scalar multiplication is almost constant and fixed for the issue.
- Minerva is one of timing attack or side channel attack for EC.
- If you don't use ECDSA class, you are not affected the vulnerability.
- The vulnerability is that attacker may guess private key by checking processing time of EC key generation or ECDSA signing.
- The cause issue is that point multiplication processing time in ECDSA signing is depends on private key value.
- After 8.0.13, processing time of point multiplication in ECDSA signing have become constant for key value in theory.
Patches
Users using ECDSA signature generation should upgrade to 8.0.13 or later.
Workarounds
There is no workarounds in jsrsasign. Update jsrsasign or use other ECDSA library.
ACKNOWLEDGEMENT
Thanks to Jan Jancar @J08nY, Petr Svenda and Vladimir Sedlacek of Masaryk University in Czech Republic to find and report this vulnerability.
References
https://minerva.crocs.fi.muni.cz/ https://www.npmjs.com/advisories/1505 https://github.com/kjur/jsrsasign/issues/411
- Record
GHSA-g753-jx37-7xwh- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N - Weakness
- CWE-362
- Updated
- 2026-11-02
OSV
ECDSA signature vulnerability of Minerva timing attack in jsrsasign
Impact
ECDSA side-channel attack named Minerava have been found and it was found that it affects to jsrsasign.
Execution time of thousands signature generation have been observed then EC private key which is scalar value may be recovered since point and scalar multiplication time depends on bits of scalar. In jsrsasign 8.0.13 or later, execution time of EC point and scalar multiplication is almost constant and fixed for the issue.
- Minerva is one of timing attack or side channel attack for EC.
- If you don't use ECDSA class, you are not affected the vulnerability.
- The vulnerability is that attacker may guess private key by checking processing time of EC key generation or ECDSA signing.
- The cause issue is that point multiplication processing time in ECDSA signing is depends on private key value.
- After 8.0.13, processing time of point multiplication in ECDSA signing have become constant for key value in theory.
Patches
Users using ECDSA signature generation should upgrade to 8.0.13 or later.
Workarounds
There is no workarounds in jsrsasign. Update jsrsasign or use other ECDSA library.
ACKNOWLEDGEMENT
Thanks to Jan Jancar @J08nY, Petr Svenda and Vladimir Sedlacek of Masaryk University in Czech Republic to find and report this vulnerability.
References
https://minerva.crocs.fi.muni.cz/ https://www.npmjs.com/advisories/1505 https://github.com/kjur/jsrsasign/issues/411
- Record
GHSA-g753-jx37-7xwh- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N - Weakness
- CWE-362
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
github.com/kjur/jsrsasign/security/advisories/GHSA-g753-jx37-7xwh
minerva.crocs.fi.muni.cz
npmjs.com/advisories/1505
snyk.io/vuln/SNYK-JS-JSRSASIGN-561755