rsync: daemon does not check for fnamecmp filenames allowing for access restriction bypass
Published Dec 6, 2017
9.8
CRITICALCVSS 3.0
EPSS 3.27%
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
No data.
Configuration 2
- 8.0
- 9.0
No data.
Red Hat Enterprise Linux 5
rsync
Will not fix
Red Hat Enterprise Linux 6
rsync
Will not fix
Red Hat Enterprise Linux 7
rsync
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | rsync | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | rsync | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | rsync | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.27% (0.03271) | 88.00th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.36% (0.03362) | 87.12th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.22% (0.01218) | 77.19th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.81% (0.03805) | 79.94th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.98% (0.00981) | 83.63th | v3 (v2023.03.01) |
| May 3, 2024 | 0.98% (0.00981) | 83.33th | v3 (v2023.03.01) |
| Jul 1, 2023 | 0.98% (0.00981) | 81.32th | v3 (v2023.03.01) |
| Jun 7, 2023 | 1.07% (0.01073) | 82.17th | v3 (v2023.03.01) |
| May 8, 2023 | 1.51% (0.01512) | 84.98th | v3 (v2023.03.01) |
| Apr 28, 2023 | 2.29% (0.02291) | 88.03th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.02% (0.02024) | 87.11th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.57% (0.01565) | 33.71th | v1 |
| Jan 6, 2022 | 1.57% (0.01565) | 33.02th | v1 |
| Sep 1, 2021 | 1.57% (0.01565) | 73.12th | v1 |
| Apr 14, 2021 | 1.57% (0.01565) | 0.00th | v1 |
References (9)
- http://security.cucumberlinux.com/security/details.php?id=170 x_refsource_CONFIRMThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-17434 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1522875 Issue Tracking
- https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=5509597decdbd7b91994210f700329d8a35e70a1 x_refsource_MISC
- https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=70aeb5fddd1b2f8e143276f8d5a085db16c593b9 x_refsource_MISC
- https://lists.debian.org/debian-lts-announce/2017/12/msg00020.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2017-17434
- https://www.cve.org/CVERecord?id=CVE-2017-17434
- https://www.debian.org/security/2017/dsa-4068 vendor-advisoryx_refsource_DEBIANThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://security.cucumberlinux.com/security/details.php?id=170 | x_refsource_CONFIRMThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2017-17434 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1522875 | Issue Tracking | |
| https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=5509597decdbd7b91994210f700329d8a35e70a1 | x_refsource_MISC | |
| https://git.samba.org/?p=rsync.git%3Ba=commit%3Bh=70aeb5fddd1b2f8e143276f8d5a085db16c593b9 | x_refsource_MISC | |
| https://lists.debian.org/debian-lts-announce/2017/12/msg00020.html | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-17434 | ||
| https://www.cve.org/CVERecord?id=CVE-2017-17434 | ||
| https://www.debian.org/security/2017/dsa-4068 | vendor-advisoryx_refsource_DEBIANThird Party Advisory |
Change history (0)
No recorded changes yet.