CVE-2019-3464

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-02-06 · updated 2026-06-17
Weakness: CWE-665

Description

Insufficient sanitization of environment variables passed to rsync can bypass the restrictions imposed by rssh, a restricted shell that should restrict users to perform only rsync operations, resulting in the execution of arbitrary shell commands.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 18.10
Debian Linux: 8.0, 9.0
Fedoraproject Fedora: 29, 30, 31
Pizzashack Rssh: 2.3.4

References

http://seclists.org/fulldisclosure/2021/May/78
http://www.securityfocus.com/bid/106839
https://lists.debian.org/debian-lts-announce/2019/02/msg00007.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HO3MDU3AH5SLYBKHH5PJ6PHC63ASIF42/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KR2OHTHMJVV4DO3HDRFQQZ5JENHDJQEN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T42YYNWJZG422GATWAHAEK4A24OKY557/
https://security.gentoo.org/glsa/202007-29
https://tracker.debian.org/news/1026713/accepted-rssh-234-5deb9u2-source-amd64-into-stable-embargoed-stable/
https://usn.ubuntu.com/3946-1/
https://www.debian.org/security/2019/dsa-4382
http://seclists.org/fulldisclosure/2021/May/78
http://www.securityfocus.com/bid/106839

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