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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
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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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