CVE-2017-17434

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-12-06 · updated 2026-06-17

Description

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.

Affected products

Debian Linux: 8.0, 9.0
RsyncProject rsync: through 3.1.2

References

http://security.cucumberlinux.com/security/details.php?id=170
https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=5509597decdbd7b91994210f700329d8a35e70a1
https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=70aeb5fddd1b2f8e143276f8d5a085db16c593b9
https://lists.debian.org/debian-lts-announce/2017/12/msg00020.html
https://www.debian.org/security/2017/dsa-4068
http://security.cucumberlinux.com/security/details.php?id=170
https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=5509597decdbd7b91994210f700329d8a35e70a1
https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=70aeb5fddd1b2f8e143276f8d5a085db16c593b9
https://lists.debian.org/debian-lts-announce/2017/12/msg00020.html
https://www.debian.org/security/2017/dsa-4068

Get alerted when CVE-2017-17434 or the next vulnerability affects your stack