Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssh | 1:7.6p1-1 | — |
| Debian 13 | openssh | 1:7.6p1-1 | — |
| Debian 12 | openssh | 1:7.6p1-1 | — |
| Debian 8 | openssh | 1:6.7p1-5+deb8u6 | DLA-1500-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | openssh | 1:7.6p1-4 | — |
| Ubuntu 16.04 LTS | openssh | 1:7.2p2-4ubuntu2.4 | USN-3538-1 |
| Ubuntu 14.04 LTS | openssh | 1:6.6p1-2ubuntu2.10 | USN-3538-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | openssh +7 | 7.4p1-16.el7 | RHSA-2018:0980 |
| RHEL 7 | pam_ssh_agent_auth | 0.10.3-2.16.el7 | RHSA-2018:0980 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | openssh | 7.2p2-74.11.1 | SUSE-SU-2017:3230-1 |
| SLES 12 SP3 | openssh-askpass-gnome | 7.2p2-74.11.3 | SUSE-SU-2017:3230-1 |
| SLES 12 SP2 | openssh | 7.2p2-74.11.1 | SUSE-SU-2017:3230-1 |
| SLES 12 SP2 | openssh-askpass-gnome | 7.2p2-74.11.3 | SUSE-SU-2017:3230-1 |
| SLES 12 SP1 | openssh | 6.6p1-54.15.2 | SUSE-SU-2018:2685-1 |
| SLES 12 SP1 | openssh-askpass-gnome | 6.6p1-54.15.1 | SUSE-SU-2018:2685-1 |
| SLES 12 | openssh | 6.6p1-54.15.2 | SUSE-SU-2018:2685-1 |
| SLES 12 | openssh-askpass-gnome | 6.6p1-54.15.1 | SUSE-SU-2018:2685-1 |
| SLES 11 SP4 | openssh +1 | 6.6p1-36.3.1 | SUSE-SU-2018:2275-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | openssh +1 | 6.2p2-0.41.5.1 | SUSE-SU-2018:3540-1 |
| SLES 11 | openssh-openssl1 | 6.6p1-19.3.1 | SUSE-SU-2018:2719-1 |
| SLES for SAP 12 SP3 | openssh | 7.2p2-74.11.1 | SUSE-SU-2017:3230-1 |
| SLES for SAP 12 SP3 | openssh-askpass-gnome | 7.2p2-74.11.3 | SUSE-SU-2017:3230-1 |
| SLES for SAP 12 SP2 | openssh | 7.2p2-74.11.1 | SUSE-SU-2017:3230-1 |
| SLES for SAP 12 SP2 | openssh-askpass-gnome | 7.2p2-74.11.3 | SUSE-SU-2017:3230-1 |
| SLES for SAP 12 SP1 | openssh | 6.6p1-54.15.2 | SUSE-SU-2018:2685-1 |
| SLES for SAP 12 SP1 | openssh-askpass-gnome | 6.6p1-54.15.1 | SUSE-SU-2018:2685-1 |
| SLES for SAP 11 SP4 | openssh +1 | 6.6p1-36.3.1 | SUSE-SU-2018:2275-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | openssh +1 | 6.2p2-0.41.5.1 | SUSE-SU-2018:3540-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssh | 7.5_p1-r8 | — |
| Alpine v3.23 | openssh | 7.5_p1-r8 | — |
| Alpine v3.22 | openssh | 7.5_p1-r8 | — |
| Alpine v3.21 | openssh | 7.5_p1-r8 | — |
| Alpine v3.20 | openssh | 7.5_p1-r8 | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openssh | 7.5_p1-r8 | — |
| Alpine v3.18 | openssh | 7.5_p1-r8 | — |
| Alpine v3.17 | openssh | 7.5_p1-r8 | — |
| Alpine v3.16 | openssh | 7.5_p1-r8 | — |
| Alpine v3.15 | openssh | 7.5_p1-r8 | — |
| Alpine v3.14 | openssh | 7.5_p1-r8 | — |
| Alpine v3.13 | openssh | 7.5_p1-r8 | — |
| Alpine v3.12 | openssh | 7.5_p1-r8 | — |
| Alpine v3.11 | openssh | 7.5_p1-r8 | — |
| Alpine v3.10 | openssh | 7.5_p1-r8 | — |
| Alpine v3.9 | openssh | 7.5_p1-r8 | — |
| Alpine v3.8 | openssh | 7.5_p1-r8 | — |
| Alpine v3.7 | openssh | 7.5_p1-r0 | — |
| Alpine v3.6 | openssh | 7.5_p1-r2 | — |
| Alpine v3.5 | openssh | 7.4_p1-r1 | — |
| Alpine v3.4 | openssh | 7.2_p1-r2 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | openssh +7 | 7.4p1-16.amzn2.0.1 | ALAS2-2018-1042 |
| Amazon Linux 2 | pam_ssh_agent_auth | 0.10.3-2.16.amzn2 | ALAS2-2018-1042 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | openssh +7 | 7.4p1-16.el7 | ELSA-2018-0980 |
| Oracle Linux 7 | pam_ssh_agent_auth | 0.10.3-2.16.el7 | ELSA-2018-0980 |
Advisories 15
- RHSA-2018:0980 Red Hat Security Advisory: openssh security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3538-1 openssh vulnerabilities Ubuntu Security Notices (USN) · Jun 1, 2026
- DLA-1500-1 openssh - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:2719-1 Security update for openssh-openssl1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:3230-1 Security update for openssh SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2275-1 Security update for openssh SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3540-1 Security update for openssh SUSE / openSUSE Security Updates · Feb 4, 2026
- VDE-2019-009 PHOENIX CONTACT: Multiple Vulnerabilities in AXC F 2152 CERT@VDE · May 22, 2025
- SUSE-SU-2018:2685-1 Security update for openssh SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-1082 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 9, 2024
- ICSA-22-349-21 Siemens SCALANCE X-200RNA Switch Devices CISA ICS & IT advisories · Dec 13, 2022
- SSA-412672 SSA-412672: Multiple OpenSSL and OpenSSH Vulnerabilities in SCALANCE X-200RNA Switch Devices before V3.2.7 Siemens ProductCERT · Dec 13, 2022
- ICSA-19-155-01 PHOENIX CONTACT PLCNext AXC F 2152 CISA ICS & IT advisories · Jun 4, 2019
- ALAS2-2018-1042 Low: openssh security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 24, 2018
- ELSA-2018-0980 Low: openssh security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 16, 2018
References
- https://www.openssh.com/txt/release-7.6
- 101552 vdb-entry
- https://github.com/openbsd/src/commit/a6981567e8e215acc1ef690c8dbb30f2d9b00a19
- GLSA-201801-05 vendor-advisory
- https://security.netapp.com/advisory/ntap-20180423-0004/
- RHSA-2018:0980 vendor-advisory
- [debian-lts-announce] 20180910 [SECURITY] [DLA 1500-1] openssh security update mailing-list
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf