ESB-2017.2750 - [Juniper] Juniper Junos PAM: Execute arbitrary code/commands - Remote/unauthenticated 2017-10-31

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2750
          2017-10 Security Bulletin: Junos: Potential remote code
              execution vulnerability in PAM (CVE-2017-10615)
                              31 October 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Juniper Junos PAM
Publisher:         Juniper Networks
Operating System:  Juniper Networks
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-10615  

Original Bulletin: 
   https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10818

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2017-10 Security Bulletin: Junos: Potential remote code execution 
vulnerability in PAM (CVE-2017-10615)

Product Affected:

This issue affects Junos OS 14.1, 14.1X53, 14.2.

Problem:

A vulnerability in the pluggable authentication module (PAM) of Juniper 
Networks Junos OS may allow an unauthenticated network based attacker to 
potentially execute arbitrary code or crash daemons such as telnetd or sshd 
that make use of PAM.

Affected Juniper Networks Junos OS releases are:

14.1 from 14.1R5 prior to 14.1R8-S4, 14.1R9;
14.1X53 prior to 14.1X53-D46 on EX and QFX series;
14.2 from 14.2R3 prior to 14.2R7-S8, 14.2R8;
15.1F6 prior to 15.1F6-S5;
15.1X49 prior to 15.1X49-D90;
15.1X53 prior to 15.1X53-D63

No other Junos OS releases are affected by this issue.

No other Juniper Networks products are affected by this issue.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue has been assigned CVE-2017-10615.

Solution:

The following software releases have been updated to resolve this specific 
issue: Junos OS 14.1R8-S3, 14.1R8-S4, 14.1R9, 14.1X53-D46, 14.2R4-S7, 
14.2R6-S4, 14.2R7-S6, 14.2R7-S8, 14.2R8, 15.1F6-S5, 15.1X49-D90, 15.1X53-D47,
15.1X53-D63, and all subsequent releases.

This issue is being tracked as PR 1192119 and is visible on the Customer 
Support website.

Note: Other Junos OS releases may contain a change for PR 1192119, but are not
affected by this issue.

Workaround:

There are no viable workarounds for this issue.

It is good security practice to limit the exploitable attack surface of 
critical infrastructure networking equipment. Use access lists or firewall 
filters to limit access to the router only from trusted, administrative 
networks or hosts.

The risk of malicious exploitation can be reduced by disabling services if 
they are not being used.

Implementation:

Security vulnerabilities in Junos are fixed in the next available Maintenance
Release of each supported Junos version. In some cases, a Maintenance Release
is not planned to be available in an appropriate time-frame. For these cases,
Service Releases are made available in order to be more timely. Security 
Advisory and Security Notices will indicate which Maintenance and Service 
Releases contain fixes for the issues described. Upon request to JTAC, 
customers will be provided download instructions for a Service Release. 
Although Juniper does not provide formal Release Note documentation for a 
Service Release, a list of "PRs fixed" can be provided on request.

Modification History:

2017-10-11: Initial Publication.

Related Links:

B16613: Overview of the Juniper Networks SIRT Monthly Security Bulletin 
Publication Process

KB16765: In which releases are vulnerabilities fixed?

KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories

CVSS Score: 9.8 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Risk Level: Critical

Risk Assessment:

Information for how Juniper Networks uses CVSS can be found at KB 16446 
"Common Vulnerability Scoring System (CVSS) and Juniper's Security 
Advisories."

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