CVE-2017-15906
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.
02 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.
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 3.35% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 88.6% of scored records. A rank, not a probability.
- NVD base score
- 5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Low. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2017-10-26 00:00Z9 YR AGO
- Last updated
- 2026-05-28 17:56Z5 MO AGO
- Reserved
- 2017-10-25
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.3)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- Data version
- 5.2
- Document digest
- a19bdd534b89a975a32b3863759b1e58324b3523ed58135b55b9729995019a1d
05 Affected products
06 References
- www.openssh.comhttps://www.openssh.com/txt/release-7.6
- www.securityfocus.com101552http://www.securityfocus.com/bid/101552
- github.comhttps://github.com/openbsd/src/commit/a6981567e8e215acc1ef690c8dbb30f2d9b00a19
- security.gentoo.orgGLSA-201801-05https://security.gentoo.org/glsa/201801-05
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20180423-0004/
- access.redhat.comRHSA-2018:0980https://access.redhat.com/errata/RHSA-2018:0980
- lists.debian.org[debian-lts-announce] 20180910 [SECURITY] [DLA 1500-1] openssh security updatehttps://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2020.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
07 Fixed in
Debian 12
- openssh Fixed in 1:7.6p1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- openssh Fixed in 1:7.6p1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- openssh Fixed in 1:7.6p1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- openssh Fixed in 1:6.6p1-2ubuntu2.10
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- openssh Fixed in 1:7.2p2-4ubuntu2.4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- openssh Fixed in 1:7.6p1-4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.