rhn-setup: rhnreg_ks fails to properly validate SSL/TLS certificates
Published Apr 12, 2018
5.9
MEDIUMCVSS 3.0
EPSS 1.19%
Description
rhnreg_ks in Red Hat Network Client Tools (aka rhn-client-tools) on Red Hat Gluster Storage 2.1 and Enterprise Linux (RHEL) 5, 6, and 7 does not properly validate hostnames in X.509 certificates from SSL servers, which allows remote attackers to prevent system registration via a man-in-the-middle attack.
Affected products
No data.
- n/a
Running on/with
- 2.1
- 5.0
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 5
rhn-client-tools
Will not fix
Red Hat Enterprise Linux 6
rhn-client-tools
Will not fix
Red Hat Enterprise Linux 7
rhn-client-tools
Will not fix
Red Hat Storage 2
rhn-client-tools
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | rhn-client-tools | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | rhn-client-tools | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | rhn-client-tools | Will not fix | n/a |
| Red Hat Storage 2 | rhn-client-tools | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the versions of rhn-client-tools as shipped with Red Hat Enterprise Linux 5, 6 and 7. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.19% (0.01191) | 66.92th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.28% (0.01276) | 66.04th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.13% (0.00128) | 29.74th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.16% (0.00159) | 53.78th | v3 (v2023.03.01) |
| Apr 6, 2023 | 0.16% (0.00162) | 51.30th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.15% (0.00155) | 49.92th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.14% (0.01136) | 58.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.14% (0.01136) | 56.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
References (6)
- http://www.openwall.com/lists/oss-security/2015/03/04/7 mailing-listx_refsource_MLISTMailing List
- http://www.securityfocus.com/bid/72943 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2015-1777 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1198740 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-1777
- https://www.cve.org/CVERecord?id=CVE-2015-1777
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2015/03/04/7 | mailing-listx_refsource_MLISTMailing List | |
| http://www.securityfocus.com/bid/72943 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2015-1777 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1198740 | x_refsource_CONFIRMIssue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-1777 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-1777 |
Change history (0)
No recorded changes yet.