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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
CVE Names: CVE-2016-10012 CVE-2016-10011 CVE-2016-10010
CVE-2016-10009 CVE-2016-6515 CVE-2016-6210
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2019-07 Security Bulletin: Junos OS: Multiple Vulnerabilities in OpenSSH
Article ID: JSA10940
Last Updated: 10 Jul 2019
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
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
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
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
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
o 2019-07-10: Initial Publication
o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
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
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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