Описание
When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
A side-channel flaw was found in NSS, in the way P-384 and P-521 curves are used in the generation of EDSA signatures, leaking partial information about the ECDSA nonce. Given a small number of ECDSA signatures, this information can be used to steal the private key. The highest threat from this vulnerability is to data confidentiality.
Отчет
This is a side-channel attack that can be used to exact pirate keys when ECDSA signatures are being generated. This attack is only feasible when the attacker is local to the machine or in certain cross-VM scenarios where the signature is being generated. Attacks over the network or via the internet are not feasible.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | nss | Out of support scope | ||
| Red Hat Enterprise Linux 6 | nss | Out of support scope | ||
| Red Hat Enterprise Linux 7 | nspr | Fixed | RHSA-2020:4076 | 29.09.2020 |
| Red Hat Enterprise Linux 7 | nss | Fixed | RHSA-2020:4076 | 29.09.2020 |
| Red Hat Enterprise Linux 7 | nss-softokn | Fixed | RHSA-2020:4076 | 29.09.2020 |
| Red Hat Enterprise Linux 7 | nss-util | Fixed | RHSA-2020:4076 | 29.09.2020 |
| Red Hat Enterprise Linux 8 | nss | Fixed | RHSA-2021:0538 | 16.02.2021 |
| Red Hat OpenShift Do | openshiftdo/odo-init-image-rhel7 | Fixed | RHSA-2021:0949 | 22.03.2021 |
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Дополнительная информация
Статус:
EPSS
4.4 Medium
CVSS3
Связанные уязвимости
When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
When converting coordinates from projective to affine, the modular inv ...
When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
Уязвимость функции модульной инверсии набора библиотек NSS (Network Security Services), позволяющая нарушителю получить несанкционированный доступ к защищаемой информации
EPSS
4.4 Medium
CVSS3