Permissions, Privileges, and Access Controls in Kerberos 5 - CVE-2015-2694
Published: May 25, 2015 / Updated: July 28, 2020
Vulnerability identifier: #VU32374
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-2694
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The kdcpreauth modules in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.2 do not properly track whether a client's request has been validated, which allows remote attackers to bypass an intended preauthentication requirement by providing (1) zero bytes of data or (2) an arbitrary realm name, related to plugins/preauth/otp/main.c and plugins/preauth/pkinit/pkinit_srv.c.
Affected software
Kerberos 5
Amazon Linux AMI
Fedora
krb5 (Alpine package)
krb5
Amazon Linux AMI
Fedora
krb5 (Alpine package)
krb5
How to mitigate CVE-2015-2694
Install update from vendor's website.
krb5 (Alpine package) - update to 1.12.1-r2
krb5 - addressed in versions 1.12.2-17.fc21, 1.13.1-3.fc22
krb5 - addressed in versions 1.12.2-17.fc21, 1.13.1-3.fc22