Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Juniper | Junos | 12.3 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/153746/FreeBSD-Security-Advisory-FreeBSD-SAThird Party AdvisoryVDB Entry
- https://kb.juniper.net/JSA10947Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00033.htmlIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00013.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00013.html
- https://seclists.org/bugtraq/2019/Jul/45Mailing ListThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:12.telnet.ascThird Party Advisory
- https://www.exploit-db.com/exploits/45982ExploitThird Party AdvisoryVDB Entry
- http://packetstormsecurity.com/files/153746/FreeBSD-Security-Advisory-FreeBSD-SAThird Party AdvisoryVDB Entry
- https://kb.juniper.net/JSA10947Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00033.htmlIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00013.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00013.html
- https://seclists.org/bugtraq/2019/Jul/45Mailing ListThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:12.telnet.ascThird Party Advisory
FAQ
What is CVE-2019-0053?
CVE-2019-0053 is a vulnerability with a CVSS score of 7.8 (HIGH). 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....
How severe is CVE-2019-0053?
CVE-2019-0053 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-0053?
Check the references section above for vendor advisories and patch information. Affected products include: Juniper Junos, Debian Debian Linux.