Security restrictions bypass in Rsync - CVE-2017-17434

Vulnerability identifier: #VU9609

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-17434

CWE-ID: CWE-284

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to the daemon  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) and bypass intended access restrictions.

Rsync
Debian Linux
Gentoo Linux
Arch Linux
Ubuntu
rsync (Alpine package)

Install update from vendor's website.

rsync (Alpine package) - update to 3.1.2-r3

• https://git.samba.org/?p=rsync.git;a=commit;h=3e06d40029cfdce9d0f73d87cfd4edaf54be9c51

• Securtiy restrictions bypass in Rsync
• Ubuntu update for rsync
• Ubuntu update for rsync
• Debian update for rsync
• Gentoo update for rsync
• Arch Linux update for rsync
• Security restrictions bypass in rsync (Alpine package)