2020-10 Security Bulletin: Junos OS: FreeBSD-SA-20:03.thrmisc: kernel stack data disclosure (CVE-2019-15875)

Product Affected:

This issue affects Junos OS 15.1, 17.2X75, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1.

Problem:

The Juniper Networks Junos OS kernel can create a core dump file when a process crashes that contains process state, for debugging. Due to incorrect initialization of a stack data structure, up to 20 bytes of kernel data previously stored on the stack will be exposed to a crashing user process, potentially disclosing sensitive kernel data.

This issue affects Juniper Networks Junos OS:

15.1 versions prior to 15.1R7-S8;
17.2X75 versions prior to 17.2X75-D45;
17.3 versions prior to 17.3R3-S9;
17.4 versions prior to 17.4R2-S11, 17.4R3-S2;
18.1 versions prior to 18.1R3-S10;
18.2 versions prior to 18.2R2-S7, 18.2R3-S5;
18.2X75 versions prior to 18.2X75-D34, 18.2X75-D430, 18.2X75-D53, 18.2X75-D60, 18.2X75-D65, 18.2X75-D70;
18.3 versions prior to 18.3R2-S4, 18.3R3-S2;
18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3-S2;
19.1 versions prior to 19.1R1-S5, 19.1R3-S1;
19.2 versions prior to 19.2R1-S5, 19.2R2;
19.3 versions prior to 19.3R2-S3, 19.3R3;
19.4 versions prior to 19.4R1-S2, 19.4R2;
20.1 versions prior to 20.1R1-S1, 20.1R2.

This issue only affects Junos OS 15.1R1 and subsequent releases. Junos OS 15.1X49, and earlier versions of Junos OS, are unaffected by this vulnerability.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue has been assigned CVE-2019-15875.

Solution:

The following software releases have been updated to resolve this specific issue: 15.1R7-S8, 17.2X75-D45, 17.3R3-S9, 17.4R2-S11, 17.4R3-S2, 18.1R3-S10, 18.2R2-S7, 18.2R3-S5, 18.2X75-D34, 18.2X75-D430, 18.2X75-D53, 18.2X75-D60, 18.2X75-D65, 18.2X75-D70, 18.3R2-S4, 18.3R3-S2, 18.4R1-S7, 18.4R2-S4, 18.4R3-S2, 19.1R1-S5, 19.1R3-S1, 19.2R1-S5, 19.2R2, 19.3R2-S3, 19.3R3, 19.4R1-S2, 19.4R2, 20.1R1-S1, 20.1R2, 20.2R1, and all subsequent releases.

This issue is being tracked as 1485747.

Workaround:

Limit access to the Junos CLI and shell to only trusted administrators.

Implementation:

Software releases or updates are available for download at https://www.juniper.net/support/downloads/.

Modification History:

2020-10-14: Initial Publication

CVSS Score:

5.5 (CVSS:3.1/AV:L/AC:L/PR:L/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."

Knowledge Base