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CVE-2017-17434· NVD / CVE Program· CNA mitre

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 str

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.

CriticalCVSS 9.8 · v3.0—No exploit Fix available
Published
Dec 5, 2017
Updated
Jun 16, 2026
EPSS
3.3% · 88th percentile
CWE
—
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Report tools

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Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.3%

Affected systems

VendorProduct
sambarsync
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux8.0
  • debian debian linux9.0
  • samba rsyncup to 3.1.2 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.12rsyncbefore 3.1.2-r73.1.2-r7
Debian:12rsyncbefore 3.1.2-2.13.1.2-2.1
Debian:7rsyncbefore 3.0.9-4+deb7u13.0.9-4+deb7u1
Debian:8rsyncbefore 3.1.1-3+deb8u13.1.1-3+deb8u1
Debian:9rsyncbefore 3.1.2-1+deb9u13.1.2-1+deb9u1
SUSE:Linux Enterprise Desktop 12 SP2rsyncbefore 3.1.0-13.7.13.1.0-13.7.1
SUSE:Linux Enterprise Server 11 SP4rsyncbefore 3.0.4-2.53.3.13.0.4-2.53.3.1

Same product

samba: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-12084Rsync: heap buffer overflow in rsync due to improper checksum length handling
    61This week
  • CVE-2017-16548The 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, w
    41Plan
  • CVE-2017-15994rsync 3.1.3-development before 2017-10-24 mishandles archaic checksums, which makes it easier for remote attackers to bypass intended access
    39Monitor
  • CVE-2026-53791rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
    36Monitor
  • CVE-2026-70461rsync 3.2.5 < 3.5.0 Heap Out-of-Bounds Write via files-from Entry
    35Monitor
  • CVE-2026-70463rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:rsync3.1.2-r7 · Alpine:v3.12Package registry (OSV)
debian:rsync3.1.2-2.1 · Debian:12Package registry (OSV)
suse:rsync3.0.4-2.53.3.1 · SUSE:Linux Enterprise Server 11 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records