Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
0

Junos OS: Insufficient validation of environment variables in telnet client may lead to stack-based buffer overflow

Disclosure Date: July 11, 2019 •
CVE-2019-0053 CVSS v3 Base Score: 7.8
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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 prior to 12.3R12-S13; 12.3X48 versions prior to 12.3X48-D80; 14.1X53 versions prior to 14.1X53-D130, 14.1X53-D49; 15.1 versions prior to 15.1F6-S12, 15.1R7-S4; 15.1X49 versions prior to 15.1X49-D170; 15.1X53 versions prior to 15.1X53-D237, 15.1X53-D496, 15.1X53-D591, 15.1X53-D69; 16.1 versions prior to 16.1R3-S11, 16.1R7-S4; 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-S6, 17.4R2-S3, 17.4R3; 18.1 versions prior to 18.1R2-S4, 18.1R3-S3; 18.2 versions prior to 18.2R1-S5, 18.2R2-S2, 18.2R3; 18.2X75 versions prior to 18.2X75-D40; 18.3 versions prior to 18.3R1-S3, 18.3R2; 18.4 versions prior to 18.4R1-S2, 18.4R2.

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CVSS V3 Severity and Metrics
Base Score:
7.8 High
Impact Score:
5.9
Exploitability Score:
1.8
Vector:
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Junos OS 12.3 versions prior to 12.3R12-S13
Junos OS 12.3X48 versions prior to 12.3X48-D80
Junos OS 14.1X53 versions prior to 14.1X53-D130 and 14.1X53-D49
Junos OS 15.1 versions prior to 15.1F6-S12 and15.1R7-S4
Junos OS 15.1X49 versions prior to 15.1X49-D170
Junos OS 15.1X53 versions prior to 15.1X53-D237 and 15.1X53-D496 and 15.1X53-D591 and 15.1X53-D69
Junos OS 16.1 versions prior to 16.1R3-S11 and 16.1R7-S4
Junos OS 16.2 versions prior to 16.2R2-S9
Junos OS 17.1 versions prior to 17.1R3
Junos OS 17.2 versions prior to 17.2R1-S8 and 17.2R2-S7 and 17.2R3-S1
Junos OS 17.3 versions prior to 17.3R3-S4
Junos OS 17.4 versions prior to 17.4R1-S6 and 17.4R2-S3 and 17.4R3
Junos OS 18.1 versions prior to 18.1R2-S4 and 18.1R3-S3
Junos OS 18.2 versions prior to 18.2R1-S5 and 18.2R2-S2 and 18.2R3
Junos OS 18.2X75 versions prior to 18.2X75-D40
Junos OS 18.3 versions prior to 18.3R1-S3 and 18.3R2
Junos OS 18.4 versions prior to 18.4R1-S2 and 18.4R2
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • debian,
  • juniper

Products

  • debian linux 10.0,
  • junos 12.3,
  • junos 12.3r12,
  • junos 12.3x48,
  • junos 14.1x53,
  • junos 15.1,
  • junos 15.1x49,
  • junos 15.1x53,
  • junos 16.1,
  • junos 16.2,
  • junos 17.1,
  • junos 17.2,
  • junos 17.3,
  • junos 17.4,
  • junos 18.1,
  • junos 18.2,
  • junos 18.2x75,
  • junos 18.3,
  • junos 18.4
Technical Analysis