Published: 11/07/2019 Updated: 10/10/2019
CVSS v2 Base Score: 4.6 | Impact Score: 6.4 | Exploitability Score: 3.9
CVSS v3 Base Score: 7.8 | Impact Score: 5.9 | Exploitability Score: 1.8
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Summary

Insufficient validation of environment variables in the telnet client supplied in Junos OS can lead to stack-based buffer overflows, which can be exploited to bypass veriexec restrictions on Junos OS. A stack-based overflow is present in the handling of environment variables when connecting via the telnet client to remote telnet servers. This issue only affects the telnet client ? accessible from the CLI or shell ? in Junos OS. Inbound telnet services are not affected by this issue. This issue affects: Juniper Networks Junos OS: 12.3 versions before 12.3R12-S13; 12.3X48 versions before 12.3X48-D80; 14.1X53 versions before 14.1X53-D130, 14.1X53-D49; 15.1 versions before 15.1F6-S12, 15.1R7-S4; 15.1X49 versions before 15.1X49-D170; 15.1X53 versions before 15.1X53-D237, 15.1X53-D496, 15.1X53-D591, 15.1X53-D69; 16.1 versions before 16.1R3-S11, 16.1R7-S4; 16.2 versions before 16.2R2-S9; 17.1 versions before 17.1R3; 17.2 versions before 17.2R1-S8, 17.2R2-S7, 17.2R3-S1; 17.3 versions before 17.3R3-S4; 17.4 versions before 17.4R1-S6, 17.4R2-S3, 17.4R3; 18.1 versions before 18.1R2-S4, 18.1R3-S3; 18.2 versions before 18.2R1-S5, 18.2R2-S2, 18.2R3; 18.2X75 versions before 18.2X75-D40; 18.3 versions before 18.3R1-S3, 18.3R2; 18.4 versions before 18.4R1-S2, 18.4R2.

Vulnerability Trend

Affected Products

Vendor Product Versions
JuniperJunos12.3, 12.3r12, 12.3x48, 14.1x53, 15.1, 15.1x49, 15.1x53, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2x75, 18.3, 18.4

Vendor Advisories

inetutils <= 197 contains a stack overflow vulnerability in the client-side environment variable handling which can be exploited to escape restricted shells on embedded devices A stack-based overflow is present in the handling of environment variables when connecting telnetc to remote telnet servers through oversized DISPLAY arguments ...

Mailing Lists

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:12telnet Security Advisory The FreeBSD Project Topic: telnet(1) client multiple vulnerabilities Categor ...