Arch Linux Security Advisory ASA-201801-21 ========================================== Severity: High Date : 2018-01-29 CVE-ID : CVE-2017-16548 CVE-2017-17433 CVE-2017-17434 CVE-2018-5764 Package : rsync Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-542 Summary ======= The package rsync before version 3.1.3pre1-1 is vulnerable to multiple issues including access restriction bypass and denial of service. Resolution ========== Upgrade to 3.1.3pre1-1. # pacman -Syu "rsync>=3.1.3pre1-1" The problems have been fixed upstream in version 3.1.3pre1. Workaround ========== None. Description =========== - CVE-2017-16548 (denial of service) The receive_xattr function in xattrs.c in rsync 3.1.2 and 3.1.3-development does not check for a trailing '\0' character in an xattr name, which allows remote attackers to cause a denial of service (heap-based buffer over-read and application crash) or possibly have unspecified other impact by sending crafted data to the daemon. - CVE-2017-17433 (access restriction bypass) The recv_files function in receiver.c in the daemon in rsync 3.1.2, and 3.1.3-development before 2017-11-03, proceeds with certain file metadata updates before checking for a filename in the daemon_filter_list data structure, which allows remote attackers to bypass intended access restrictions. - CVE-2017-17434 (access restriction bypass) The daemon in rsync 3.1.2, and 3.1.3-development before 2017-12-03, does not check for fnamecmp filenames in the daemon_filter_list data structure (in the recv_files function in receiver.c) and also does not apply the sanitize_paths protection mechanism to pathnames found in "xname follows" strings (in the read_ndx_and_attrs function in rsync.c), which allows remote attackers to bypass intended access restrictions. - CVE-2018-5764 (access restriction bypass) The parse_arguments function in options.c in rsyncd in rsync before 3.1.3 does not prevent multiple --protect-args uses, which allows remote attackers to bypass an argument-sanitization protection mechanism. Impact ====== A remote attacker is able to bypass access restrictions or cause a denial of service by sending a maliciously crafted request to rsyncd. References ========== https://bugs.archlinux.org/task/57111 https://git.samba.org/?p=rsync.git;a=commitdiff;h=47a63d90e71d3e19e0e96052bb... https://git.samba.org/?p=rsync.git;a=commitdiff;h=3e06d40029cfdce9d0f73d87cf... https://git.samba.org/?p=rsync.git;a=commitdiff;h=5509597decdbd7b91994210f70... https://git.samba.org/?p=rsync.git;a=commitdiff;h=70aeb5fddd1b2f8e143276f8d5... https://git.samba.org/?p=rsync.git;a=commitdiff;h=7706303828fcde524222babb28... https://security.archlinux.org/CVE-2017-16548 https://security.archlinux.org/CVE-2017-17433 https://security.archlinux.org/CVE-2017-17434 https://security.archlinux.org/CVE-2018-5764