THREATPORT/VULNERABILITY/CVE-2017-17434
CRITICAL SEVERITY

CVE-2017-17434

Rsync vulnerability

CVSS
9.8
EPSS
3.4%
EPSS pct
87th
Exploited
No known
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 vendor
Samba
Affected product
Rsync
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2017-12-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 87% of all scored CVEs.

Check your external exposure to CVE-2017-17434

  • Confirm whether Samba Rsync is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2017-17434.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-17434

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-17434 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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