krb5: Metadata taken from the unauthenticated plaintext
Published Jul 13, 2017
8.1
HIGHCVSS 3.1
EPSS 5.12%
Description
Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in a way that violates the Kerberos 5 protocol specification. In _krb5_extract_ticket() the KDC-REP service name must be obtained from the encrypted version stored in 'enc_part' instead of the unencrypted version stored in 'ticket'. Use of the unencrypted version provides an opportunity for successful server impersonation and other attacks. NOTE: this CVE is only for Heimdal and other products that embed Heimdal code; it does not apply to other instances in which this part of the Kerberos 5 protocol specification is violated.
Affected products
No data.
Configuration 1
- < 7.4.0
Configuration 3
Configuration 5
- 8.0
- 9.0
- 10.0
No data.
Red Hat Enterprise Linux 5
krb5
Not affected
Red Hat Enterprise Linux 5
samba
Not affected
Red Hat Enterprise Linux 6
krb5
Not affected
Red Hat Enterprise Linux 6
samba
Not affected
Red Hat Enterprise Linux 6
samba4
Not affected
Red Hat Enterprise Linux 7
krb5
Not affected
Red Hat Enterprise Linux 7
samba
Not affected
Red Hat JBoss Enterprise Application Platform 6
krb5
Not affected
Red Hat JBoss Enterprise Web Server 2
krb5
Not affected
Red Hat JBoss Enterprise Web Server 3
krb5
Not affected
Red Hat Storage 3
samba
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 5 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 6 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba4 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | samba | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | krb5 | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | krb5 | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 3 | krb5 | Not affected | n/a |
| Red Hat Storage 3 | samba | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the version of MIT Kerberos implementation as shipped with Red Hat Enterprise Linux. This issue also does not affect the version of Samba as shipped with Red Hat Enterprise Linux.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:N/C:P/I:P/A:P
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 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.12% (0.05118) | 92.12th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.12% (0.05118) | 91.27th | v5 (v2026.06.15) |
| Mar 30, 2025 | 5.77% (0.05766) | 89.54th | v4 (v2025.03.14) |
| Mar 29, 2025 | 10.32% (0.10321) | 88.55th | v4 (v2025.03.14) |
| Mar 20, 2025 | 5.77% (0.05766) | 89.67th | v4 (v2025.03.14) |
| Mar 17, 2025 | 7.56% (0.07560) | 91.20th | v4 (v2025.03.14) |
| Dec 17, 2024 | 2.92% (0.02923) | 90.57th | v3 (v2023.03.01) |
| Oct 17, 2023 | 4.70% (0.04697) | 91.70th | v3 (v2023.03.01) |
| Sep 8, 2023 | 6.50% (0.06502) | 92.84th | v3 (v2023.03.01) |
| May 8, 2023 | 6.97% (0.06967) | 92.88th | v3 (v2023.03.01) |
| Apr 28, 2023 | 5.85% (0.05851) | 92.26th | v3 (v2023.03.01) |
| Mar 7, 2023 | 5.80% (0.05805) | 92.19th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.50% (0.00504) | 11.01th | v1 |
| Jan 6, 2022 | 0.50% (0.00504) | 10.72th | v1 |
| Sep 1, 2021 | 0.50% (0.00504) | 28.18th | v1 |
| Apr 14, 2021 | 0.50% (0.00504) | 0.00th | v1 |
References (16)
- http://www.debian.org/security/2017/dsa-3912 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.h5l.org/advisories.html?show=2017-07-11 x_refsource_CONFIRMBroken Link
- http://www.securityfocus.com/bid/99551 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038876 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039427 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2017-11103 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1469976 Issue Tracking
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0 x_refsource_CONFIRMRelease Notes
- https://nvd.nist.gov/vuln/detail/CVE-2017-11103
- https://support.apple.com/HT208112 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/HT208144 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/HT208221 x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-11103
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc vendor-advisoryx_refsource_FREEBSDThird Party Advisory
- https://www.orpheus-lyre.info/ x_refsource_MISCThird Party Advisory
- https://www.samba.org/samba/security/CVE-2017-11103.html x_refsource_CONFIRMThird Party Advisory
Change history (0)
No recorded changes yet.