Stack-based buffer overflow in Junos OS - CVE-2019-0053

Vulnerability identifier: #VU19149

CSH Severity: Medium

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-0053

CWE-ID: CWE-121

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to execute arbitrary code on the target system.

The vulnerability exists due to insufficient validation of environment variables when connecting via the telnet client to remote telnet servers. A local authenticated attacker can trigger stack-based buffer overflow, bypass veriexec restrictions and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

This vulnerability only affects the telnet client - accessible from the CLI or shel.

Junos OS
Arch Linux
Ubuntu
inetutils (Ubuntu package)
EMC Isilon OneFS

Install updates from vendor's website.

Junos OS - addressed in versions 12.3X48-D80, 12.3R12-S13, 14.1X53-D49, 14.1X53-D130, 15.1F6-S12, 15.1X49-D170, 15.1X53-D69, 15.1X53-D237, 15.1X53-D496, 15.1X53-D591, 15.1R7-S4, 16.1R3-S11, 16.1R7-S4, 16.2R2-S9, 17.1R3, 17.2R1-S8, 17.2R2-S7, 17.2R3-S1, 17.3R3-S4, 17.4R1-S6, 17.4R2-S3, 17.4R3, 18.1R2-S4, 18.1R3-S3, 18.2X75-D40, 18.2R1-S5, 18.2R2-S2, 18.2R3, 18.3R1-S3, 18.3R2, 18.4R1-S2, 18.4R2
inetutils (Ubuntu package) - addressed in versions 2:1.9.2-1ubuntu0.1~esm2, 2:1.9.4-1ubuntu0.1~esm3, 2:1.9.4-3ubuntu0.1+esm2, 2:1.9.4-11ubuntu0.2+esm1
EMC Isilon OneFS - update to 8.2.1

• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10947&cat=SIRT_1&actp=LIST

• Stack-based buffer overflow in Juniper Junos OS
• Arch Linux update for inetutils
• Stack-based buffer overflow in Dell EMC Isilon OneFS
• Ubuntu update for inetutils