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.
総合評価: CVE-2017-11103 は中リスク（64.4/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 5.64%、90 パーセンタイル） 根拠: EPSS 上、短期間での悪用可能性は高い水準です。 推奨対応: 悪用可能性が高いため、影響範囲の確認と修補の優先付けを推奨します。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-05-31 | 5.28% | 5.64% | +0.35% |
| 2 | 2026-05-10 | 5.71% | 5.28% | -0.42% |
| 3 | 2026-04-24 | — | 5.71% | — |
EPSS の全履歴 （全 17 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 8.1 | 3.1 | HIGH |
|
2.2 | 5.9 | [email protected] |
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2017-11103: 1 source package rows (heimdal); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. | https://security.alpinelinux.org/vuln/CVE-2017-11103 |
debian
|
not yet assigned | CVE-2017-11103 not yet assigned priority: Debian including 2 source packages (heimdal, samba), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. | https://security-tracker.debian.org/tracker/CVE-2017-11103 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2017-11103 |
ubuntu
|
medium | CVE-2017-11103 medium priority: Ubuntu including 2 source packages (heimdal, samba), 10 status rows across 5 suites (trusty, upstream, xenial, yakkety, zesty): released 8, needs-triage 2. | https://ubuntu.com/security/CVE-2017-11103 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| heimdal_project | heimdal | < 7.4.0 | cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* |
| freebsd | freebsd | — | cpe:2.3:o:freebsd:freebsd:-:*:*:*:*:*:*:* |
| samba | samba | >= 4.0.0, < 4.4.15 | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* |
| samba | samba | >= 4.5.0, < 4.5.12 | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* |
| samba | samba | >= 4.6.0, < 4.6.6 | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* |
| apple | iphone_os | < 11.0 | cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* |
| apple | mac_os_x | < 10.13.1 | cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* |
| debian | debian_linux | 8.0 | cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| http://www.debian.org/security/2017/dsa-3912 | Third Party Advisory |
| http://www.h5l.org/advisories.html?show=2017-07-11 | Broken Link |
| http://www.securityfocus.com/bid/99551 | Third Party Advisory VDB Entry |
| http://www.securitytracker.com/id/1038876 | Third Party Advisory VDB Entry |
| http://www.securitytracker.com/id/1039427 | Third Party Advisory VDB Entry |
| https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0 | Release Notes |
| https://support.apple.com/HT208112 | Third Party Advisory |
| https://support.apple.com/HT208144 | Third Party Advisory |
| https://support.apple.com/HT208221 | Third Party Advisory |
| https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc | Third Party Advisory |
| https://www.orpheus-lyre.info/ | Third Party Advisory |
| https://www.samba.org/samba/security/CVE-2017-11103.html | Third Party Advisory |