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TI-2015-05506 Aliases CVE-2015-6563GHSA-2f6c-wrfr-f7rw

The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts…

Priority LOW 31CWE-20Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 16 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00381 32nd percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 16 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*up to 6.9VulnerableOpenBSD
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*up to 10.11.0VulnerableApple
  • cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* Versions up to 6.9 Vulnerable ·OpenBSD
  • cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* Versions up to 10.11.0 Vulnerable ·Apple

Remediation

Red Hat 2 advisories

  • RHSA-2016:0741 Released 2016-05-10 · Red Hat rating Moderate
    openssh 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
  • RHSA-2015:2088 Released 2015-11-19 · Red Hat rating Moderate
    openssh security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) openssh-6.6.1p1-22.el7, openssh-askpass-6.6.1p1-22.el7, openssh-clients-6.6.1p1-22.el7 +2
    • Red Hat Enterprise Linux Client Optional (v. 7) openssh-ldap-6.6.1p1-22.el7, openssh-server-sysvinit-6.6.1p1-22.el7, pam_ssh_agent_auth-0.9.3-9.22.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) openssh-6.6.1p1-22.el7, openssh-clients-6.6.1p1-22.el7, openssh-keycat-6.6.1p1-22.el7 +1
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssh-askpass-6.6.1p1-22.el7, openssh-ldap-6.6.1p1-22.el7, openssh-server-sysvinit-6.6.1p1-22.el7 +1
    • Red Hat Enterprise Linux Server (v. 7) openssh-6.6.1p1-22.el7, openssh-askpass-6.6.1p1-22.el7, openssh-clients-6.6.1p1-22.el7 +2
    • Red Hat Enterprise Linux Server Optional (v. 7) openssh-askpass-6.6.1p1-22.el7, openssh-ldap-6.6.1p1-22.el7, openssh-server-sysvinit-6.6.1p1-22.el7 +2
    • Red Hat Enterprise Linux Workstation (v. 7) openssh-6.6.1p1-22.el7, openssh-askpass-6.6.1p1-22.el7, openssh-clients-6.6.1p1-22.el7 +2
    • Red Hat Enterprise Linux Workstation Optional (v. 7) openssh-ldap-6.6.1p1-22.el7, openssh-server-sysvinit-6.6.1p1-22.el7, pam_ssh_agent_auth-0.9.3-9.22.el7

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 4AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2015:2088
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2015:2088
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2015:2088
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2015:2088
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 (v. 7)Fixed RHSA-2015:2088
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2016:0741
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2015:2088
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2016:0741
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2015:2088
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2016:0741
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2015:2088

Timeline

  1. 2026-10-02 Threatist record created from CVE-2015-6563
  2. 2026-10-03 Alias added: GHSA-2f6c-wrfr-f7rw

References

Advisory 6

Other 11

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences