The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly…
Priority LOW 36CWE-732Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.
Summary
The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03359 88th percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 27
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* | before 7.6 | Vulnerable | OpenBSD |
| cpe:2.3:a:oracle:sun_zfs_storage_appliance_kit:8.8.6:*:*:*:*:*:*:* | 8.8.6 | Vulnerable | Oracle |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:data_ontap_edge:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
- cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* Versions before 7.6 Vulnerable ·OpenBSD
- cpe:2.3:a:oracle:sun_zfs_storage_appliance_kit:8.8.6:*:*:*:*:*:*:* Versions 8.8.6 Vulnerable ·Oracle
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:data_ontap_edge:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
Show 17 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap:*:*:*:*:*:vmware_vsphere:*:* | 9.7 | Vulnerable | NetApp |
| cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap:9.6:*:*:*:*:vmware_vsphere:*:* | 9.6 | Vulnerable | NetApp |
| cpe:2.3:a:netapp:vasa_provider_for_clustered_data_ontap:*:*:*:*:*:*:*:* | 6.0 – 6.2; 9.7 | Vulnerable | NetApp |
| cpe:2.3:a:netapp:virtual_storage_console:*:*:*:*:*:vmware_vsphere:*:* | 9.7 | Vulnerable | NetApp |
| cpe:2.3:a:netapp:virtual_storage_console:9.6:*:*:*:*:vmware_vsphere:*:* | 9.6 | Vulnerable | NetApp |
| cpe:2.3:o:netapp:cn1610_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:cn1610:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:* | 7.7 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:* | 7.7 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:* | 7.7 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
- cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap:*:*:*:*:*:vmware_vsphere:*:* Versions 9.7 Vulnerable ·NetApp
- cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap:9.6:*:*:*:*:vmware_vsphere:*:* Versions 9.6 Vulnerable ·NetApp
- cpe:2.3:a:netapp:vasa_provider_for_clustered_data_ontap:*:*:*:*:*:*:*:* Versions 6.0 – 6.2; 9.7 Vulnerable ·NetApp
- cpe:2.3:a:netapp:virtual_storage_console:*:*:*:*:*:vmware_vsphere:*:* Versions 9.7 Vulnerable ·NetApp
- cpe:2.3:a:netapp:virtual_storage_console:9.6:*:*:*:*:vmware_vsphere:*:* Versions 9.6 Vulnerable ·NetApp
- cpe:2.3:o:netapp:cn1610_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:cn1610:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:* Versions 7.7 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:* Versions 7.7 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:* Versions 7.7 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
Remediation
Red Hat 1 advisory
- RHSA-2018:0980 Released 2018-04-10 · Red Hat rating Lowopenssh security, bug fix, and enhancement update
- Red Hat Enterprise Linux Client (v. 7) openssh-7.4p1-16.el7, openssh-askpass-7.4p1-16.el7, openssh-clients-7.4p1-16.el7 +2
- Red Hat Enterprise Linux Client Optional (v. 7) openssh-cavs-7.4p1-16.el7, openssh-ldap-7.4p1-16.el7, openssh-server-sysvinit-7.4p1-16.el7 +1
- Red Hat Enterprise Linux ComputeNode (v. 7) openssh-7.4p1-16.el7, openssh-clients-7.4p1-16.el7, openssh-keycat-7.4p1-16.el7 +1
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssh-askpass-7.4p1-16.el7, openssh-cavs-7.4p1-16.el7, openssh-ldap-7.4p1-16.el7 +2
- Red Hat Enterprise Linux Server (v. 7) openssh-7.4p1-16.el7, openssh-askpass-7.4p1-16.el7, openssh-clients-7.4p1-16.el7 +2
- Red Hat Enterprise Linux Server Optional (v. 7) openssh-cavs-7.4p1-16.el7, openssh-ldap-7.4p1-16.el7, openssh-server-sysvinit-7.4p1-16.el7 +2
- Red Hat Enterprise Linux Workstation (v. 7) openssh-7.4p1-16.el7, openssh-askpass-7.4p1-16.el7, openssh-clients-7.4p1-16.el7 +2
- Red Hat Enterprise Linux Workstation Optional (v. 7) openssh-cavs-7.4p1-16.el7, openssh-ldap-7.4p1-16.el7, openssh-server-sysvinit-7.4p1-16.el7 +1
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) openssh-7.4p1-16.el7, openssh-askpass-7.4p1-16.el7, openssh-clients-7.4p1-16.el7 +2
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) openssh-cavs-7.4p1-16.el7, openssh-ldap-7.4p1-16.el7, openssh-server-sysvinit-7.4p1-16.el7 +1
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) | Fixed | RHSA-2018:0980 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) | Fixed | RHSA-2018:0980 |
Not affected: 2 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2017-15906
- 2026-10-03 Alias added: GHSA-543w-q592-87ph
References
Advisory 7
- https://www.openssh.com/txt/release-7.6
- https://github.com/openbsd/src/commit/a6981567e8e215acc1ef690c8dbb30f2d9b00a19
- GLSA-201801-05
- https://security.netapp.com/advisory/ntap-20180423-0004/
- RHSA-2018:0980
- [debian-lts-announce] 20180910 [SECURITY] [DLA 1500-1] openssh security update
- https://www.oracle.com/security-alerts/cpujan2020.html
Sources
- CVE-2017-15906 · CVE Program
- CVE-2017-15906 · NVD
- FIRST EPSS
- GHSA-543w-q592-87ph · GitHub Advisory Database · CC BY 4.0
- CVE-2017-15906 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences