NULL pointer dereference in Kerberos 5 and Kerberos - CVE-2018-5710
Published: August 4, 2020
Vulnerability identifier: #VU33342
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-5710
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. The pre-defined function "strlen" is getting a "NULL" string as a parameter value in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c in the Key Distribution Center (KDC), which allows remote authenticated users to cause a denial of service (NULL pointer dereference) via a modified kadmin client.
Affected software
Kerberos 5
Kerberos
krb5 (Alpine package)
Kerberos
krb5 (Alpine package)
How to mitigate CVE-2018-5710
Install update from vendor's website.
Kerberos 5 - update to 1.16.1
Kerberos - update to 5-1.16.1
krb5 (Alpine package) - update to 1.15.3-r0
Kerberos - update to 5-1.16.1
krb5 (Alpine package) - update to 1.15.3-r0