CVE-2015-2694

Severity: medium (CVSS 5.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-05-25 · updated 2026-06-17
Weakness: CWE-264

Description

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 products

MIT Kerberos 5: 1.12, 1.12.1, 1.12.2, 1.12.3, 1.13, 1.13.1

References

http://krbdev.mit.edu/rt/Ticket/Display.html?id=8160
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/74824
http://www.ubuntu.com/usn/USN-2810-1
https://github.com/krb5/krb5/commit/e3b5a5e5267818c97750b266df50b6a3d4649604
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8160
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/74824
http://www.ubuntu.com/usn/USN-2810-1
https://github.com/krb5/krb5/commit/e3b5a5e5267818c97750b266df50b6a3d4649604

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