Vulnerabilities > CVE-2019-3464 - Improper Initialization vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
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.
Vulnerable Configurations
Part | Description | Count |
---|---|---|
Application | 1 | |
OS | 2 | |
OS | 3 | |
OS | 4 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
- Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
Nessus
NASL family Fedora Local Security Checks NASL id FEDORA_2019-E47ADD6B2B.NASL description Fix CVE-2019-3463, CVE-2019-3464 and CVE-2019-1000018. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 130801 published 2019-11-12 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130801 title Fedora 31 : rssh (2019-e47add6b2b) NASL family Fedora Local Security Checks NASL id FEDORA_2019-D1487C13AC.NASL description Fix CVE-2019-3463, CVE-2019-3464 and CVE-2019-1000018. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 130796 published 2019-11-12 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130796 title Fedora 30 : rssh (2019-d1487c13ac) NASL family Amazon Linux Local Security Checks NASL id ALA_ALAS-2019-1328.NASL description Insufficient sanitation 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. (CVE-2019-3464) Insufficient sanitation of arguments 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. (CVE-2019-3463) rssh version 2.3.4 contains a CWE-77: Improper Neutralization of Special Elements used in a Command ( last seen 2020-06-01 modified 2020-06-02 plugin id 132323 published 2019-12-20 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/132323 title Amazon Linux AMI : rssh (ALAS-2019-1328) NASL family Fedora Local Security Checks NASL id FEDORA_2019-BFB407659E.NASL description Fix CVE-2019-3463, CVE-2019-3464 and CVE-2019-1000018. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 130794 published 2019-11-12 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130794 title Fedora 29 : rssh (2019-bfb407659e) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4382.NASL description Nick Cleaton discovered two vulnerabilities in rssh, a restricted shell that allows users to perform only scp, sftp, cvs, svnserve (Subversion), rdist and/or rsync operations. Missing validation in the rsync support could result in the bypass of this restriction, allowing the execution of arbitrary shell commands. last seen 2020-03-17 modified 2019-02-04 plugin id 121560 published 2019-02-04 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/121560 title Debian DSA-4382-1 : rssh - security update NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_D193AA9F3F8C11E99A246805CA0B38E8.NASL description NVD reports : rssh version 2.3.4 contains a CWE-77: Improper Neutralization of Special Elements used in a Command ( last seen 2020-06-01 modified 2020-06-02 plugin id 122658 published 2019-03-07 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/122658 title FreeBSD : rssh - multiple vulnerabilities (d193aa9f-3f8c-11e9-9a24-6805ca0b38e8) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3946-1.NASL description It was discovered that rssh incorrectly handled certain command-line arguments and environment variables. An authenticated user could bypass rssh last seen 2020-06-01 modified 2020-06-02 plugin id 124019 published 2019-04-12 reporter Ubuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124019 title Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : rssh vulnerabilities (USN-3946-1)
References
- https://tracker.debian.org/news/1026713/accepted-rssh-234-5deb9u2-source-amd64-into-stable-embargoed-stable/
- https://www.debian.org/security/2019/dsa-4382
- https://lists.debian.org/debian-lts-announce/2019/02/msg00007.html
- http://www.securityfocus.com/bid/106839
- https://usn.ubuntu.com/3946-1/
- https://security.gentoo.org/glsa/202007-29
- http://seclists.org/fulldisclosure/2021/May/78
- 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/T42YYNWJZG422GATWAHAEK4A24OKY557/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KR2OHTHMJVV4DO3HDRFQQZ5JENHDJQEN/