An OpenSSH vulnerability could allow an unauthenticated, remote attacker to determine whether given usernames exist or not on the server. No further information is disclosed and there is no potential impact to availability or integrity. This vulnerability may affect the SSH management plane service of ACOS devices and is addressed in this document.
|Item #||Vulnerability ID||Score Source||Score||Summary|
|1||CVE-2018-15473||CVSS 3.0||5.3 Med||openssh: User enumeration via malformed packets in authentication requests |
The table below indicates releases of ACOS exposed to these vulnerabilities and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.
Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.
|Releases Affected||Releases Resolved or Unaffected|
|4.1.4 – 4.1.4-GR1||4.1.4-GR1-P1, 5.1.0, 5.2.0|
|4.1.2 – 4.1.2-P4||4.1.2-P5|
|4.1.1 – 4.1.1-P9||4.1.1-P10|
|4.1.100 – 4.1.100-P5||4.1.100-P5-SP1|
|4.1.0 – 4.1.0-P11||4.1.0-P12|
|3.2.5 – 3.2.5-P5||3.2.5-P6, 5.0.1, 5.0.2|
|3.2.4 – 3.2.4-P1||3.2.4-P2|
|3.2.3 – 3.2.3-P5||3.2.3-P6|
|3.2.2 – 3.2.2-P7||3.2.2-P8|
|2.8.2 – 2.8.2-Px||4.1.2-P5|
|2.7.2 – 2.7.2-Px||4.1.0-P12, 4.1.1-P10, 4.1.2-P5, 4.1.4-GR1-P1|
|2.7.1 – 2.7.1-GR1-Px||4.1.0-P12, 4.1.1-P10, 4.1.2-P5, 4.1.4-GR1-P1|
|2.6.1-GR1 – 2.6.1-GR1-P16||4.1.0-P12, 4.1.1-P10, 4.1.2-P5, 4.1.4-GR1-P1|
Common security best practices in the industry for network appliance management and control planes can enhance protection against remote malicious attacks. Limit the exploitable attack surface for critical, infrastructure, networking equipment through the use of access lists or firewall filters to and from only trusted, administrative networks or hosts.
Software updates that address these vulnerabilities are or will be published at the following URL:
The following table shares brief descriptions of the vulnerabilities addressed in this document.
|Vulnerability ID||Vulnerability Description|
OpenSSH through 7.7 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.
|Ref #||General Link|
|||NIST NVD, CVE-2018-15473|
|1.0||October 12, 2018||
|2.0||August 8, 2019||
Updated affected and resolved releases for 4.1.4-GR1 and 3.x ACOS release families, including addition of 3.2.4 release family.
|3.0||October 11, 2019||
Added 4.1.100 release family
|4.0||July 23, 2021||
Added 3.2.5, 5.0.1, 5.0.2, 5.1.0, 5.2.0 release families
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