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amazonAmazonALAS-2018-1075
HistorySep 05, 2018 - 8:41 p.m.

Low: openssh

2018-09-0520:41:00
alas.aws.amazon.com
534

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

0.02 Low

EPSS

Percentile

88.5%

Issue Overview:

OpenSSH is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.(CVE-2018-15473)

Affected Packages:

openssh

Issue Correction:
Run yum update openssh to update your system.

New Packages:

i686:  
    openssh-server-7.4p1-16.71.amzn1.i686  
    openssh-clients-7.4p1-16.71.amzn1.i686  
    openssh-keycat-7.4p1-16.71.amzn1.i686  
    openssh-cavs-7.4p1-16.71.amzn1.i686  
    openssh-7.4p1-16.71.amzn1.i686  
    pam_ssh_agent_auth-0.10.3-2.16.71.amzn1.i686  
    openssh-ldap-7.4p1-16.71.amzn1.i686  
    openssh-debuginfo-7.4p1-16.71.amzn1.i686  
  
src:  
    openssh-7.4p1-16.71.amzn1.src  
  
x86_64:  
    openssh-keycat-7.4p1-16.71.amzn1.x86_64  
    openssh-debuginfo-7.4p1-16.71.amzn1.x86_64  
    openssh-server-7.4p1-16.71.amzn1.x86_64  
    openssh-cavs-7.4p1-16.71.amzn1.x86_64  
    openssh-clients-7.4p1-16.71.amzn1.x86_64  
    openssh-ldap-7.4p1-16.71.amzn1.x86_64  
    openssh-7.4p1-16.71.amzn1.x86_64  
    pam_ssh_agent_auth-0.10.3-2.16.71.amzn1.x86_64  

Additional References

Red Hat: CVE-2018-15473

Mitre: CVE-2018-15473

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

0.02 Low

EPSS

Percentile

88.5%