The x11_open_helper function in channels.c in ssh in OpenSSH before 6.9, when…
Priority LOW 27CWE-264Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Partial · None
- Fix status
- Partial Red Hat: 8 fixed, 1 without a fix
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-264.
Summary
The x11_open_helper function in channels.c in ssh in OpenSSH before 6.9, when ForwardX11Trusted mode is not used, lacks a check of the refusal deadline for X connections, which makes it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window.
Why it matters now
EPSS 0.04519 91st percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 8 fixed, 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
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
Remediation
Red Hat 1 advisory
- RHSA-2016:0741 Released 2016-05-10 · Red Hat rating Moderateopenssh security, bug fix, and enhancement update
- Red Hat Enterprise Linux Desktop (v. 6) openssh-5.3p1-117.el6, openssh-askpass-5.3p1-117.el6, openssh-clients-5.3p1-117.el6 +1
- Red Hat Enterprise Linux Desktop Optional (v. 6) openssh-ldap-5.3p1-117.el6, pam_ssh_agent_auth-0.9.3-117.el6
- Red Hat Enterprise Linux HPC Node (v. 6) openssh-5.3p1-117.el6, openssh-clients-5.3p1-117.el6, openssh-server-5.3p1-117.el6
- Red Hat Enterprise Linux HPC Node Optional (v. 6) openssh-askpass-5.3p1-117.el6, openssh-ldap-5.3p1-117.el6, pam_ssh_agent_auth-0.9.3-117.el6
- Red Hat Enterprise Linux Server (v. 6) openssh-5.3p1-117.el6, openssh-askpass-5.3p1-117.el6, openssh-clients-5.3p1-117.el6 +1
- Red Hat Enterprise Linux Server Optional (v. 6) openssh-ldap-5.3p1-117.el6, pam_ssh_agent_auth-0.9.3-117.el6, pam_ssh_agent_auth-0.9.3-117.el6.ppc
- Red Hat Enterprise Linux Workstation (v. 6) openssh-5.3p1-117.el6, openssh-askpass-5.3p1-117.el6, openssh-clients-5.3p1-117.el6 +1
- Red Hat Enterprise Linux Workstation Optional (v. 6) openssh-ldap-5.3p1-117.el6, pam_ssh_agent_auth-0.9.3-117.el6
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2016:0741 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2016:0741 |
| Red Hat Enterprise Linux HPC Node (v. 6) | Fixed | RHSA-2016:0741 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2016:0741 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2016:0741 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2016:0741 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2016:0741 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2016:0741 |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2015-5352
- 2026-10-03 Alias added: GHSA-6fpx-j7j8-53rc
References
Advisory 6
Other 7
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- https://security.netapp.com/advisory/ntap-20181023-0001/
- https://anongit.mindrot.org/openssh.git/commit/?h=V_6_9&id=1bf477d3cdf1a864646d59820878783d42357a1d
- [oss-security] 20150701 Re: CVE Request: two security issues in openSSH 6.9
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- [debian-lts-announce] 20180910 [SECURITY] [DLA 1500-1] openssh security update
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
More OpenBSD Openssh vulnerabilities
- TI-2023-19792 The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently… CVSS 3.1CRITICAL 9.8
- TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
- TI-2023-10601 OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during… CVSS 3.1MEDIUM 6.5
- TI-2018-11033 OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying… CVSS 3.1MEDIUM 5.9
- TI-2016-08105 Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4… CVSS 3.1HIGH 7.3
- TI-2023-28040 In ssh in OpenSSH before 9.6, OS command injection might occur if a user name or host… CVSS 3.1MEDIUM 6.5
Sources
- CVE-2015-5352 · CVE Program
- CVE-2015-5352 · NVD
- FIRST EPSS
- GHSA-6fpx-j7j8-53rc · GitHub Advisory Database · CC BY 4.0
- CVE-2015-5352 · 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