CVE-2019-0053
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.59%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.59% probability · 46th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-121, CWE-787
- Affected
- juniper/junos · debian/debian linux
- Source
- sirt@juniper.net
References
- http://packetstormsecurity.com/files/153746/FreeBSD-Security-Advisory-FreeBSD-SA-19-12.telnet.htmlThird Party Advisory, VDB Entry
- https://kb.juniper.net/JSA10947Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00033.htmlIssue Tracking, Third 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://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 List, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:12.telnet.ascThird Party Advisory
- https://www.exploit-db.com/exploits/45982Exploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153746/FreeBSD-Security-Advisory-FreeBSD-SA-19-12.telnet.htmlThird Party Advisory, VDB Entry
- https://kb.juniper.net/JSA10947Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00033.htmlIssue Tracking, Third 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://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 List, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:12.telnet.ascThird Party Advisory
- https://www.exploit-db.com/exploits/45982Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.