The append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.3 allows remote attackers to cause a denial of service (out-of-bounds read) by clearing the high bit of the byte after invalid utf-8 encoded data.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2016-4356 from the MITRE CVE dictionary dictionary and NIST NVD.
Red Hat Product Security has rated this issue as having moderate security impact, a future update may address this flaw in libksba.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 5.1 |
|---|---|
| Base Metrics | AV:N/AC:H/Au:N/C:P/I:P/A:P |
| Access Vector | Network |
| Access Complexity | High |
| Authentication | None |
| Confidentiality Impact | Partial |
| Integrity Impact | Partial |
| Availability Impact | Partial |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | libksba | Fix deferred |
| Red Hat Enterprise Linux 6 | libksba | Fix deferred |
| Red Hat Enterprise Linux 5 | libksba | Fix deferred |
Vulmon