Vulnerability Description
Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Samba | Samba | >= 4.0.0, < 4.7.12 |
| Canonical | Ubuntu Linux | 12.04 |
| Debian | Debian Linux | 8.0 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/106027Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851Issue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00005.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
- https://usn.ubuntu.com/3827-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4345Third Party Advisory
- https://www.samba.org/samba/security/CVE-2018-16851.htmlPatchVendor Advisory
- http://www.securityfocus.com/bid/106027Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851Issue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00005.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
FAQ
What is CVE-2018-16851?
CVE-2018-16851 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the cli...
How severe is CVE-2018-16851?
CVE-2018-16851 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-16851?
Check the references section above for vendor advisories and patch information. Affected products include: Samba Samba, Canonical Ubuntu Linux, Debian Debian Linux.