Описание
There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).
An integer overflow was found in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. As per upstream:
- No EC algorithms are affected.
- Attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely.
- Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway.
- Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME
Отчет
Accelerated modular exponentiation for Intel processors (RSAZ) was introduced in openssl-1.0.2, therefore older versions of OpenSSL are not affected by this flaw.
Меры по смягчению последствий
For Red Hat Enterprise Linux 7, 512 bit DH is already disabled. As this bug is about leakage of the private key to the attacker, it should be fully sufficient to just not use 1024 bit RSA keys or 1024 bit DSA keys. These keys are not secure enough anyway. 3-prime RSA keys are not supported on RHEL-7. For Red Hat Enterprise 8, The DEFAULT crypto policy already disables all these key sizes. Also applications compiled with openssl which use the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME, other users of this API are not affected by this flaw.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | openssl | Not affected | ||
| Red Hat Enterprise Linux 5 | openssl097a | Not affected | ||
| Red Hat Enterprise Linux 6 | openssl | Not affected | ||
| Red Hat Enterprise Linux 6 | openssl098e | Not affected | ||
| Red Hat Enterprise Linux 7 | openssl | Fix deferred | ||
| Red Hat Enterprise Linux 7 | openssl098e | Not affected | ||
| Red Hat Enterprise Linux 8 | compat-openssl10 | Fix deferred | ||
| Red Hat JBoss Enterprise Application Platform 6 | openssl | Out of support scope | ||
| Red Hat JBoss Enterprise Web Server 2 | openssl | Out of support scope | ||
| JBoss Core Services on RHEL 6 | jbcs-httpd24-apr | Fixed | RHSA-2020:4384 | 28.10.2020 |
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Дополнительная информация
Статус:
EPSS
4.8 Medium
CVSS3
Связанные уязвимости
There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).
There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).
There is an overflow bug in the x64_64 Montgomery squaring procedure u ...
EPSS
4.8 Medium
CVSS3