SB2018090704 - Amazon Linux AMI update for krb5
Published: September 7, 2018
Security Bulletin ID
SB2018090704
Severity
High
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Denial of service (CVE-ID: CVE-2017-11368)
The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.The weakness exists due to an assertion failure. A remote attacker can send invalid S4U2Self or S4U2Proxy requests and cause the krb5kdc service to exit on a targeted system.
Successful exploitation of the vulnerability results in denial of service.
2) Authentication bypass (CVE-ID: CVE-2017-7562)
The vulnerability allows a remote authenticated attacker to write arbitrary files on the target system.The weakness exists due to an authentication bypass in the way krb5's certauth interface handled the validation of client certificates. A remote attacker can impersonate arbitrary principals under rare and erroneous circumstances.
Remediation
Install update from vendor's website.