3.7 Low
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
0.975 High
EPSS
Percentile
100.0%
Issue Overview:
A flaw was found in the way the TLS protocol composes the Diffie-Hellman (DH) key exchange. A man-in-the-middle attacker could use this flaw to force the use of weak 512 bit export-grade keys during the key exchange, allowing them do decrypt all traffic. (CVE-2015-4000)
Please note that this update forces the TLS/SSL client implementation in NSS to reject DH key sizes below 768 bits, which prevents sessions to be downgraded to export-grade keys. Future updates may raise this limit to 1024 bits.
Affected Packages:
nss, nss-util
Issue Correction:
Run yum update nss nss-util to update your system.
New Packages:
i686:
nss-util-3.19.1-1.41.amzn1.i686
nss-util-devel-3.19.1-1.41.amzn1.i686
nss-util-debuginfo-3.19.1-1.41.amzn1.i686
nss-sysinit-3.19.1-3.71.amzn1.i686
nss-tools-3.19.1-3.71.amzn1.i686
nss-devel-3.19.1-3.71.amzn1.i686
nss-pkcs11-devel-3.19.1-3.71.amzn1.i686
nss-3.19.1-3.71.amzn1.i686
nss-debuginfo-3.19.1-3.71.amzn1.i686
src:
nss-util-3.19.1-1.41.amzn1.src
nss-3.19.1-3.71.amzn1.src
x86_64:
nss-util-debuginfo-3.19.1-1.41.amzn1.x86_64
nss-util-3.19.1-1.41.amzn1.x86_64
nss-util-devel-3.19.1-1.41.amzn1.x86_64
nss-pkcs11-devel-3.19.1-3.71.amzn1.x86_64
nss-tools-3.19.1-3.71.amzn1.x86_64
nss-devel-3.19.1-3.71.amzn1.x86_64
nss-sysinit-3.19.1-3.71.amzn1.x86_64
nss-3.19.1-3.71.amzn1.x86_64
nss-debuginfo-3.19.1-3.71.amzn1.x86_64
Red Hat: CVE-2015-4000
Mitre: CVE-2015-4000
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 1 | i686 | nss-util | < 3.19.1-1.41.amzn1 | nss-util-3.19.1-1.41.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss-util-devel | < 3.19.1-1.41.amzn1 | nss-util-devel-3.19.1-1.41.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss-util-debuginfo | < 3.19.1-1.41.amzn1 | nss-util-debuginfo-3.19.1-1.41.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss-sysinit | < 3.19.1-3.71.amzn1 | nss-sysinit-3.19.1-3.71.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss-tools | < 3.19.1-3.71.amzn1 | nss-tools-3.19.1-3.71.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss-devel | < 3.19.1-3.71.amzn1 | nss-devel-3.19.1-3.71.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss-pkcs11-devel | < 3.19.1-3.71.amzn1 | nss-pkcs11-devel-3.19.1-3.71.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss | < 3.19.1-3.71.amzn1 | nss-3.19.1-3.71.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | nss-debuginfo | < 3.19.1-3.71.amzn1 | nss-debuginfo-3.19.1-3.71.amzn1.i686.rpm |
Amazon Linux | 1 | x86_64 | nss-util-debuginfo | < 3.19.1-1.41.amzn1 | nss-util-debuginfo-3.19.1-1.41.amzn1.x86_64.rpm |
3.7 Low
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
0.975 High
EPSS
Percentile
100.0%