8.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:P/I:N/A:C
0.164 Low
EPSS
Percentile
96.0%
Issue Overview:
A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users.
It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks.
A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges.
Affected Packages:
openssh
Issue Correction:
Run yum update openssh to update your system.
New Packages:
i686:
openssh-6.6.1p1-22.58.amzn1.i686
openssh-server-6.6.1p1-22.58.amzn1.i686
pam_ssh_agent_auth-0.9.3-9.22.58.amzn1.i686
openssh-keycat-6.6.1p1-22.58.amzn1.i686
openssh-ldap-6.6.1p1-22.58.amzn1.i686
openssh-debuginfo-6.6.1p1-22.58.amzn1.i686
openssh-clients-6.6.1p1-22.58.amzn1.i686
src:
openssh-6.6.1p1-22.58.amzn1.src
x86_64:
openssh-6.6.1p1-22.58.amzn1.x86_64
openssh-clients-6.6.1p1-22.58.amzn1.x86_64
pam_ssh_agent_auth-0.9.3-9.22.58.amzn1.x86_64
openssh-server-6.6.1p1-22.58.amzn1.x86_64
openssh-debuginfo-6.6.1p1-22.58.amzn1.x86_64
openssh-keycat-6.6.1p1-22.58.amzn1.x86_64
openssh-ldap-6.6.1p1-22.58.amzn1.x86_64
Red Hat: CVE-2015-5600, CVE-2015-6563, CVE-2015-6564
Mitre: CVE-2015-5600, CVE-2015-6563, CVE-2015-6564
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 1 | i686 | openssh | < 6.6.1p1-22.58.amzn1 | openssh-6.6.1p1-22.58.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | openssh-server | < 6.6.1p1-22.58.amzn1 | openssh-server-6.6.1p1-22.58.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | pam_ssh_agent_auth | < 0.9.3-9.22.58.amzn1 | pam_ssh_agent_auth-0.9.3-9.22.58.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | openssh-keycat | < 6.6.1p1-22.58.amzn1 | openssh-keycat-6.6.1p1-22.58.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | openssh-ldap | < 6.6.1p1-22.58.amzn1 | openssh-ldap-6.6.1p1-22.58.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | openssh-debuginfo | < 6.6.1p1-22.58.amzn1 | openssh-debuginfo-6.6.1p1-22.58.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | openssh-clients | < 6.6.1p1-22.58.amzn1 | openssh-clients-6.6.1p1-22.58.amzn1.i686.rpm |
Amazon Linux | 1 | x86_64 | openssh | < 6.6.1p1-22.58.amzn1 | openssh-6.6.1p1-22.58.amzn1.x86_64.rpm |
Amazon Linux | 1 | x86_64 | openssh-clients | < 6.6.1p1-22.58.amzn1 | openssh-clients-6.6.1p1-22.58.amzn1.x86_64.rpm |
Amazon Linux | 1 | x86_64 | pam_ssh_agent_auth | < 0.9.3-9.22.58.amzn1 | pam_ssh_agent_auth-0.9.3-9.22.58.amzn1.x86_64.rpm |