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Fencer Intel
medium 5.3

CVE-2017-15906 json

The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows…

published 2017-10-26 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-7325

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

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.

Patch / fix

  • openbsd openssh 7.6
  • openssh Debian 14, Debian 13, Debian 12 1:7.6p1-1

debian advisories DEBIAN-CVE-2017-15906

  • openssh Ubuntu 14.04 LTS 1:6.6p1-2ubuntu2.10
  • openssh Ubuntu 16.04 LTS 1:7.2p2-4ubuntu2.4
  • openssh Ubuntu 18.04 LTS 1:7.6p1-4

ubuntu advisories UBUNTU-CVE-2017-15906

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssh RHEL 7 7.4p1-16.el7
  • openssh-cavs RHEL 7 7.4p1-16.el7
  • openssh-ldap RHEL 7 7.4p1-16.el7
  • openssh-keycat RHEL 7 7.4p1-16.el7
  • openssh-server RHEL 7 7.4p1-16.el7
  • openssh-askpass RHEL 7 7.4p1-16.el7
  • openssh-clients RHEL 7 7.4p1-16.el7
  • pam_ssh_agent_auth RHEL 7 0.10.3-2.16.el7

red hat advisories RHSA-2018:0980

  • openssh SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 6.2p2-0.41.5.1
  • openssh-askpass-gnome SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 6.2p2-0.41.5.1
  • openssh-openssl1 SLES 11-SECURITY 6.6p1-19.3.1
  • openssh SLES for SAP 11 SP4, SLES 11 SP4 6.6p1-36.3.1
  • openssh-askpass-gnome SLES for SAP 11 SP4, SLES 11 SP4 6.6p1-36.3.1
  • openssh SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +4 more 7.2p2-74.11.1
  • openssh-askpass-gnome SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +4 more 7.2p2-74.11.3
  • openssh SLES for SAP 12 SP1, SLES 12-LTSS, SLES 12 SP1-LTSS 6.6p1-54.15.2

suse advisories SUSE-SU-2018:3540-1SUSE-SU-2018:2719-1SUSE-SU-2018:2685-1SUSE-SU-2018:2275-1SUSE-SU-2017:3230-1

  • openssh Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 7.5_p1-r8
  • openssh Alpine 3.4 7.2_p1-r2
  • openssh Alpine 3.5 7.4_p1-r1
  • openssh Alpine 3.6 7.5_p1-r2
  • openssh Alpine 3.7 7.5_p1-r0

alpine advisories ALPINE-CVE-2017-15906

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-15906 updated cvss 4.3

openssh: Improper write operations in readonly mode allow for zero-length file creation

  • Red Hat Enterprise Linux Client (v. 7) openssh 7.4p1-16.el7, openssh-keycat 7.4p1-16.el7, openssh-server 7.4p1-16.el7, openssh-askpass 7.4p1-16.el7, openssh-clients 7.4p1-16.el7 Red Hat Enterprise Linux Client Optional (v. 7) openssh-cavs 7.4p1-16.el7, openssh-ldap 7.4p1-16.el7, pam_ssh_agent_auth 0.10.3-2.16.el7, openssh-server-sysvinit 7.4p1-16.el7 Red Hat Enterprise Linux ComputeNode (v. 7) openssh 7.4p1-16.el7, openssh-keycat 7.4p1-16.el7, openssh-server 7.4p1-16.el7, openssh-clients 7.4p1-16.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssh-cavs 7.4p1-16.el7, openssh-ldap 7.4p1-16.el7, openssh-askpass 7.4p1-16.el7, pam_ssh_agent_auth 0.10.3-2.16.el7, openssh-server-sysvinit 7.4p1-16.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) openssh 7.4p1-16.el7, openssh-keycat 7.4p1-16.el7, openssh-server 7.4p1-16.el7, openssh-askpass 7.4p1-16.el7, openssh-clients 7.4p1-16.el7 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, pam_ssh_agent_auth 0.10.3-2.16.el7, openssh-server-sysvinit 7.4p1-16.el7
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) openssh 7.4p1-16.el7, openssh-keycat 7.4p1-16.el7, openssh-server 7.4p1-16.el7, openssh-askpass 7.4p1-16.el7, openssh-clients 7.4p1-16.el7 Red Hat Enterprise Linux Server Optional (v. 7) openssh-cavs 7.4p1-16.el7, openssh-ldap 7.4p1-16.el7, pam_ssh_agent_auth 0.10.3-2.16.el7, openssh-server-sysvinit 7.4p1-16.el7 Red Hat Enterprise Linux Workstation (v. 7) openssh 7.4p1-16.el7, openssh-keycat 7.4p1-16.el7, openssh-server 7.4p1-16.el7, openssh-askpass 7.4p1-16.el7, openssh-clients 7.4p1-16.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) openssh-cavs 7.4p1-16.el7, openssh-ldap 7.4p1-16.el7, pam_ssh_agent_auth 0.10.3-2.16.el7, openssh-server-sysvinit 7.4p1-16.el7
    fixed: vendor fix RHSA-2018:0980
  • Red Hat Enterprise Linux 5 openssh Red Hat Enterprise Linux 6 openssh, openssh-ldap, openssh-server, openssh-askpass, openssh-clients, pam_ssh_agent_auth
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-22-349-21 updated cvss 5.3

Siemens SCALANCE X-200RNA Switch Devices

  • Siemens SCALANCE X204RNA (HSR) (6GK5204-0BA00-2MB2) <V3.2.7 Siemens SCALANCE X204RNA (PRP) (6GK5204-0BA00-2KB2) <V3.2.7 Siemens SCALANCE X204RNA EEC (HSR) (6GK5204-0BS00-2NA3) <V3.2.7 Siemens SCALANCE X204RNA EEC (PRP) (6GK5204-0BS00-3LA3) <V3.2.7 Siemens SCALANCE X204RNA EEC (PRP/HSR) (6GK5204-0BS00-3PA3) <V3.2.7
    affected: fixed in V3.2.7, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-19-155-01 updated cvss 5.3

PHOENIX CONTACT PLCNext AXC F 2152

  • Phoenix Contact AXC F 2152 2404267 version 1.x, 1046568 (Starterkit) version 1.x
    affected: vendor fix, mitigation “Phoenix Contact recommends affected users update to firmware release 2019.0 LTS or later, update to PLCNext Engineer release 2019.0 LTS or later, and apply the following specific mitigations below:” phoenixcontact.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

3.36% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.