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

  [JSA10852] Show Article Properties


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

 

Related Links:
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