A stack based buffer overflow was found in the get_matching_data() function, when reading the principal's certificate during pkinit preauthentication. If the Certifcate Authority's subject line is sufficiently long, an attacker able to have a specially crafted certificate signed could crash the authentication process, such as kinit, or, possibly, run arbitrary code.
Find out more about CVE-2017-15088 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue affects the versions of krb5 as shipped with Red Hat Enterprise Linux 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/.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 7.1 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss EWS 2 | krb5 | Not affected |
| Red Hat JBoss EAP 6 | krb5 | Not affected |
| Red Hat JBoss Core Services 1 | krb5 | Not affected |
| Red Hat Enterprise Linux 7 | krb5 | Will not fix |
| Red Hat Enterprise Linux 6 | krb5 | Not affected |
| Red Hat Enterprise Linux 5 | krb5 | Not affected |
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