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             AUSCERT External Security Bulletin Redistribution

         JSA10940 - 2019-07 Security Bulletin: Junos OS: Multiple
                        Vulnerabilities in OpenSSH
                               11 July 2019


        AusCERT Security Bulletin Summary

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account      
                   Increased Privileges            -- Existing Account      
                   Access Privileged Data          -- Existing Account      
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-10012 CVE-2016-10011 CVE-2016-10010
                   CVE-2016-10009 CVE-2016-6515 CVE-2016-6210
                   CVE-2015-8325 CVE-2015-6564 

Reference:         ASB-2018.0293

Original Bulletin: 

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2019-07 Security Bulletin: Junos OS: Multiple Vulnerabilities in OpenSSH

Article ID:   JSA10940

Last Updated: 10 Jul 2019

Version:      8.0

Product Affected:
This issue affects all products and platforms running Junos OS

Multiple vulnerabilities have been resolved in Junos OS by updating third party
software included with Junos OS or by fixing vulnerabilities found during
internal testing.

These issues potentially affect Juniper Networks Junos OS:

  o 12.3X48 versions prior to 12.3X48-D55;
  o 12.3 versions prior to 12.3R12-S13;
  o 15.1X49 versions prior to 15.1X49-D100;
  o 15.1 versions prior to 15.1F6-S12, 15.1R5-S4, 15.1R6-S1, 15.1R7;
  o 16.1 versions prior to 16.1R3-S4, 16.1R4-S3, 16.1R5;
  o 16.2 versions prior to 16.2R1-S4, 16.2R2;
  o 17.1 versions prior to 17.1R1-S2, 17.1R2;
  o 17.2 versions prior to 17.2R1.

Juniper SIRT is not aware of any malicious exploitation of these

These issues were discovered during external security research.

Important security issues resolved include:

     CVE            CVSS                           Summary
                              The do_setup_env function in session.c in sshd in
                              OpenSSH through 7.2p2, when the UseLogin feature
               7.8 ( CVSS:3.0 is enabled and PAM is configured to read
CVE-2015-8325  /AV:L/AC:L/    .pam_environment files in user home directories,
               PR:L/UI:N/S:U/ allows local users to gain privileges by
               C:H/I:H/A:H )  triggering a crafted environment for the /bin/
                              login program, as demonstrated by an LD_PRELOAD
                              environment variable.
                              sshd in OpenSSH before 7.3, when SHA256 or SHA512
               5.9 ( CVSS:3.0 are used for user password hashing, uses BLOWFISH
               /AV:N/AC:H/    hashing on a static password when the username
CVE-2016-6210  PR:N/UI:N/S:U/ does not exist, which allows remote attackers to
               C:H/I:N/A:N )  enumerate users by leveraging the timing
                              difference between responses when a large
                              password is provided.
                              The auth_password function in auth-passwd.c in
               7.5 ( CVSS:3.0 sshd in OpenSSH before 7.3 does not limit
CVE-2016-6515  /AV:N/AC:L/    password lengths for password authentication,
               PR:N/UI:N/S:U/ which allows remote attackers to cause a denial
               C:N/I:N/A:H )  of service (crypt CPU consumption) via a long
                              Use-after-free vulnerability in the
               4.8 ( CVSS:3.0 mm_answer_pam_free_ctx function in monitor.c in
               /AV:N/AC:H/    sshd in OpenSSH before 7.0 on non-OpenBSD
CVE-2015-6564  PR:N/UI:N/S:U/ platforms might allow local users to gain
               C:L/I:L/A:N )  privileges by leveraging control of the sshd uid
                              to send an unexpectedly early
                              MONITOR_REQ_PAM_FREE_CTX request.
               7.3 ( CVSS:3.0 Untrusted search path vulnerability in
               /AV:N/AC:L/    ssh-agent.c in ssh-agent in OpenSSH before 7.4
CVE-2016-10009 PR:N/UI:N/S:U/ allows remote attackers to execute arbitrary
               C:L/I:L/A:L )  local PKCS#11 modules by leveraging control over
                              a forwarded agent-socket.
               7.0 ( CVSS:3.0 sshd in OpenSSH before 7.4, when privilege
               /AV:L/AC:H/    separation is not used, creates forwarded
CVE-2016-10010 PR:L/UI:N/S:U/ Unix-domain sockets as root, which might allow
               C:H/I:H/A:H )  local users to gain privileges via unspecified
                              vectors, related to serverloop.c.
                              authfile.c in sshd in OpenSSH before 7.4 does not
               5.5 ( CVSS:3.0 properly consider the effects of realloc on
CVE-2016-10011 /AV:L/AC:L/    buffer contents, which might allow local users to
               PR:L/UI:N/S:U/ obtain sensitive private-key information by
               C:H/I:N/A:N )  leveraging access to a privilege-separated child
                              The shared memory manager (associated with
                              pre-authentication compression) in sshd in
               7.8 ( CVSS:3.0 OpenSSH before 7.4 does not ensure that a bounds
CVE-2016-10012 /AV:L/AC:L/    check is enforced by all compilers, which might
               PR:L/UI:N/S:U/ allows local users to gain privileges by
               C:H/I:H/A:H )  leveraging access to a sandboxed
                              privilege-separation process, related to the
                              m_zback and m_zlib data structures.


The following software releases have been updated to resolve this specific
issue: 12.3X48-D55, 12.3R12-S13, 15.1X49-D100, 15.1F6-S12, 15.1R5-S4,
15.1R6-S1, 15.1R7, 16.1R3-S4, 16.1R4-S3, 16.1R5, 16.2R1-S4, 16.2R2, 17.1R1-S2,
17.1R2, 17.2R1 and all subsequent releases.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of
Engineering (EOE) or End of Life (EOL).

These issues are being tracked as PR 1208815 which are visible on the Customer
Support website.


There are no viable workarounds for these issues.

To reduce the risk of exploitation of these issues use access lists or firewall
filters to limit access to the device(s) to only trusted administrative
networks, hosts and users.

Software Releases, patches and updates are available at https://www.juniper.net
/support/downloads/ .

Modification History:

  o 2019-07-10: Initial Publication

Related Links:

  o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
    Publication Process

  o KB16765: In which releases are vulnerabilities fixed

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

  o Report a Security Vulnerability - How to Contact the Juniper Networks
    Security Incident Response Team

CVSS Score:
5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)

Risk Level:

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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