CVE-2017-11103
heimdal - security update
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.
How to fix CVE-2017-11103
To remediate CVE-2017-11103, upgrade the affected package to a fixed version below.
- —upgrade to 7.4.0-r0 or later
- —upgrade to 4.2.14-r4 or later
- —upgrade to 1.6~rc2+dfsg-9+deb8u1 or later
- —upgrade to 7.4.0.dfsg.1-1 or later
- —upgrade to 1.6~git20120403+dfsg1-2+deb7u1 or later
- —upgrade to 2:4.6.5+dfsg-4 or later
- —upgrade to 2:4.2.14+dfsg-0+deb8u7 or later
Is CVE-2017-11103 being exploited?
Moderate — EPSS is 5.6%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (7)
- from 0, < 7.4.0-r0
- from 0, < 4.2.14-r4
- from 0, < 1.6~rc2+dfsg-9+deb8u1
- from 0, < 7.4.0.dfsg.1-1
- from 0, < 1.6~git20120403+dfsg1-2+deb7u1
- from 0, < 2:4.6.5+dfsg-4
- from 0, < 2:4.2.14+dfsg-0+deb8u7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |