ESB-2018.1130 - [Juniper] stunnel: Multiple vulnerabilities 2018-04-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1130
               Junos OS: Multiple vulnerabilities in stunnel
                               12 April 2018

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

Product:           stunnel
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Access Privileged Data          -- Remote/Unauthenticated      
                   Unauthorised Access             -- Remote/Unauthenticated      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-3644 CVE-2014-0016 CVE-2013-1762
                   CVE-2008-2420 CVE-2008-2400 

Reference:         AA-2008.0120
                   ESB-2015.1758
                   ESB-2013.0625
                   ESB-2013.0491

Original Bulletin: 
   https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10852

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2018-04 Security Bulletin: Junos OS: Multiple vulnerabilities in stunnel


CVSS Score:7.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
Risk Level: Medium


Product Affected:

All products and platforms running Junos OS


Problem:

Multiple vulnerabilities in stunnel software included with Junos OS have been
resolved by upgrading stunnel to 5.38.

Stunnel is used for providing SSL/TLS protection to Junos XML protocol server
(xnm-ssl). These issues only affect devices where xnm-ssl is configured.

Affected releases are Juniper Networks Junos OS:

    12.1X46 prior to 12.1X46-D76;
    12.3;
    12.3X48 versions prior to 12.3X48-D50;
    15.1 versions prior to 15.1R7;
    15.1X49 versions prior to 15.1X49-D100;
    16.1 versions prior to 16.1R5;
    16.2 versions prior to 16.2R2;
    17.1 versions prior to 17.1R2;

Important vulnerabilities resolved in stunnel 5.38 include:


    CVE         CVSS                           Summary
                         stunnel before 5.00, when using fork threading, does
              4.3 (AV:N/ not properly update the state of the OpenSSL
              AC:M/Au:N/ pseudo-random number generator (PRNG), which causes
CVE-2014-0016 C:P/I:N/   subsequent children with the same process ID to use
              A:N)       the same entropy pool and allows remote attackers to
                         obtain private keys for EC (ECDSA) or DSA
                         certificates.
              6.8 (AV:N/ The OCSP functionality in stunnel before 4.24 does not
CVE-2008-2420 AC:M/Au:N/ properly search certificate revocation lists (CRL),
              C:P/I:P/   which allows remote attackers to bypass intended
              A:P)       access restrictions by using revoked certificates.


Solution:

Stunnel software included with Junos OS 12.1X46, 12.3X48 has been upgraded from
4.04 to 5.38 in 12.1X46-D76, 12.3X48-D50 and subsequent releases.

Stunnel software in Junos 15.1 and above has been upgraded from 5.01 to 5.38.
This resolves CVE-2013-1762, CVE-2014-0016 and CVE-2015-3644.

The following software releases have been updated to resolve this specific
issue: 12.1X46-D76, 12.3X48-D50, 15.1R7, 15.1X49-D100, 16.1R5, 16.2R2, 17.1R2,
17.2R1, and all subsequent releases.

Upgraded stunnel software includes the fixes for CVE-2015-3644, CVE-2013-1762,
CVE-2008-2400, however these issues do not affect or impact Junos OS.

These issues are being tracked as PR 1226804 and 31143 which are visible on the
Customer Support website.

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


Workaround:

Limit access to the administrative interfaces such as xnm-ssl on the device to
only trusted networks and hosts.

Disable xnm-ssl if Junos XML access to the device is not required or being used


Implementation:

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


Modification History:

    2018-04-11: Initial Publication.

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