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2019-07 Security Bulletin: Junos OS: OpenSSL Security Advisory [26 Feb 2019]

 [JSA10949] Show Article Properties

Product Affected:
These issues affect all products and platforms running Junos OS.
Problem:

The ​OpenSSL project has published a security advisory for a vulnerability resolved in the OpenSSL library on February 28, 2019.

Affected releases are Juniper Networks Junos OS:

  • 12.3X48 versions prior to 12.3X48-D80;
  • 14.1X53 versions prior to 14.1X53-D51;
  • 15.1 versions prior to 15.1F6-S13, 15.1R7-S4;
  • 15.1X49 versions prior to 15.1X49-D171, 15.1X49-D180;
  • 15.1X53 versions prior to 15.1X53-D238, 15.1X53-D591, 15.1X53-D69;
  • 16.1 versions prior to 16.1R7-S5;
  • 16.2 versions prior to 16.2R2-S9;
  • 17.1 versions prior to 17.1R3;
  • 17.2 versions prior to 17.2R1-S8, 17.2R2-S7, 17.2R3-S1;
  • 17.3 versions prior to 17.3R3-S4;
  • 17.4 versions prior to 17.4R1-S7, 17.4R2-S4, 17.4R3;
  • 18.1 versions prior to 18.1R2-S4, 18.1R3-S5;
  • 18.2 versions prior to 18.2R1-S5, 18.2R2-S3, 18.2R3;
  • 18.2X75 versions prior to 18.2X75-D50;
  • 18.3 versions prior to 18.3R1-S3, 18.3R1-S4, 18.3R2;
  • 18.4 versions prior to 18.4R1-S2, 18.4R2;
  • 19.1 versions prior to 19.1R1-S1, 19.1R2.


Juniper SIRT is not aware of any malicious exploitation of these vulnerabilities.

These issues were discovered during external security research.

The important security issue resolved is described below:

CVE CVSS Summary
CVE-2019-1559 5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).
Solution:

The following software releases have been updated to resolve this specific issue: 12.3X48-D80, 14.1X53-D51, 15.1F6-S13, 15.1R7-S4, 15.1X49-D171, 15.1X49-D180, 15.1X53-D238, 15.1X53-D591, 15.1X53-D69, 16.1R7-S5, 16.2R2-S9, 17.1R3, 17.2R1-S8, 17.2R2-S7, 17.2R3-S1, 17.3R3-S4, 17.4R1-S7, 17.4R2-S4, 17.4R3, 18.1R2-S4, 18.1R3-S5, 18.2R1-S5, 18.2R2-S3, 18.2R3, 18.2X75-D50, 18.3R1-S3, 18.3R1-S4, 18.3R2, 18.4R1-S2, 18.4R2, 19.1R1-S1, 19.1R2, 19.2R1, and all subsequent releases.

This issue is being tracked as PR 1419533 which is visible on the Customer Support website.
 

Workaround:

Since SSL is used for remote network configuration and management applications such as J-Web and SSL Service for JUNOScript (XNM-SSL), viable workarounds for this issue in Junos may include:

  • Disabling J-Web
  • Disable SSL service for JUNOScript and only use Netconf, which makes use of SSH, to make configuration changes
  • Limit access to J-Web and XNM-SSL from only trusted networks
  • Avoid connecting to untrusted servers for file copy operations
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
  • ​2019-07-10: Initial Publication
Related Links:
CVSS Score:
5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
Severity Level:
Medium
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."