Описание
Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.
It was found that NSS permitted skipping of the ServerKeyExchange packet during a handshake involving ECDHE (Elliptic Curve Diffie-Hellman key Exchange). A remote attacker could use this flaw to bypass the forward-secrecy of a TLS/SSL connection.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | gnutls | Not affected | ||
| Red Hat Enterprise Linux 5 | openssl | Not affected | ||
| Red Hat Enterprise Linux 6 | gnutls | Not affected | ||
| Red Hat Enterprise Linux 6 | openssl | Not affected | ||
| Red Hat Enterprise Linux 7 | gnutls | Not affected | ||
| Red Hat Enterprise Linux 7 | openssl | Not affected | ||
| Red Hat Enterprise Linux 5 | nss | Fixed | RHSA-2015:1664 | 24.08.2015 |
| Red Hat Enterprise Linux 6 | nss | Fixed | RHSA-2015:1185 | 25.06.2015 |
| Red Hat Enterprise Linux 6 | nss-util | Fixed | RHSA-2015:1185 | 25.06.2015 |
| Red Hat Enterprise Linux 7 | nss | Fixed | RHSA-2015:1185 | 25.06.2015 |
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Дополнительная информация
Статус:
EPSS
5.1 Medium
CVSS2
Связанные уязвимости
Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.
Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.
Mozilla Network Security Services (NSS) before 3.19, as used in Mozill ...
Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.
ELSA-2015-1664: nss security, bug fix, and enhancement update (MODERATE)
EPSS
5.1 Medium
CVSS2