{"id":"UBUNTU-CVE-2019-0053","details":"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.","modified":"2026-02-04T02:25:15.987396Z","published":"2019-07-11T20:15:00Z","related":["USN-7781-1"],"upstream":["CVE-2019-0053"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-0053"},{"type":"REPORT","url":"https://www.freebsd.org/security/advisories/FreeBSD-SA-19:12.telnet.asc"},{"type":"REPORT","url":"https://raw.githubusercontent.com/hackerhouse-opensource/exploits/master/inetutils-telnet.txt"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2018/12/14/8"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-0053"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7781-1"}],"affected":[{"package":{"name":"inetutils","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/inetutils@2:1.9.2-1ubuntu0.1~esm2?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.9.2-1ubuntu0.1~esm2"}]}],"versions":["2:1.9.1.306-0a482-1","2:1.9.1.363-bbc1-1","2:1.9.2-1","2:1.9.2-1ubuntu0.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"inetutils-ftp","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-ftpd","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-inetd","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-ping","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-syslogd","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-talk","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-talkd","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-telnet","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-telnetd","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-tools","binary_version":"2:1.9.2-1ubuntu0.1~esm2"},{"binary_name":"inetutils-traceroute","binary_version":"2:1.9.2-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-0053.json"}},{"package":{"name":"inetutils","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/inetutils@2:1.9.4-1ubuntu0.1~esm3?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.9.4-1ubuntu0.1~esm3"}]}],"versions":["2:1.9.4-1","2:1.9.4-1build1","2:1.9.4-1ubuntu0.1~esm1","2:1.9.4-1ubuntu0.1~esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"inetutils-ftp","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-ftpd","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-inetd","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-ping","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-syslogd","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-talk","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-talkd","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-telnet","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-telnetd","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-tools","binary_version":"2:1.9.4-1ubuntu0.1~esm3"},{"binary_name":"inetutils-traceroute","binary_version":"2:1.9.4-1ubuntu0.1~esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-0053.json"}},{"package":{"name":"socks4-server","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/socks4-server@4.3.beta2-19build1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.beta2-19","4.3.beta2-19build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libsocks4","binary_version":"4.3.beta2-19build1"},{"binary_name":"socks4-clients","binary_version":"4.3.beta2-19build1"},{"binary_name":"socks4-server","binary_version":"4.3.beta2-19build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-0053.json"}},{"package":{"name":"inetutils","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/inetutils@2:1.9.4-3ubuntu0.1+esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.9.4-3ubuntu0.1+esm2"}]}],"versions":["2:1.9.4-2build1","2:1.9.4-3","2:1.9.4-3ubuntu0.1","2:1.9.4-3ubuntu0.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"inetutils-ftp","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-ftpd","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-inetd","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-ping","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-syslogd","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-talk","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-talkd","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-telnet","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-telnetd","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-tools","binary_version":"2:1.9.4-3ubuntu0.1+esm2"},{"binary_name":"inetutils-traceroute","binary_version":"2:1.9.4-3ubuntu0.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-0053.json"}},{"package":{"name":"socks4-server","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/socks4-server@4.3.beta2-20?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.beta2-20"],"ecosystem_specific":{"binaries":[{"binary_name":"libsocks4","binary_version":"4.3.beta2-20"},{"binary_name":"socks4-clients","binary_version":"4.3.beta2-20"},{"binary_name":"socks4-server","binary_version":"4.3.beta2-20"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-0053.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}