CVE-2015-2694

krb5: issues in OTP and PKINIT kdcpreauth modules leading to requires_preauth bypass

Severity Score

5.8

*CVSS v2

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Los módulos kdcpreauth en MIT Kerberos 5 (también conocido como krb5) 1.12.x y 1.13.x anterior a 1.13.2 no rastrea correctamente si la solicitud de un cliente ha sido validada, lo que permite a atacantes remotos evadir un requisito de preautenticación mediante la provisión de (1) cero bytes de datos o (2) un nombre de ámbito (realm) arbitrario, relacionado con plugins/preauth/otp/main.c y plugins/preauth/pkinit/pkinit_srv.c.

A flaw was found in the OTP kdcpreauth module of MIT Kerberos. A remote attacker could use this flaw to bypass the requires_preauth flag on a client principal and obtain a ciphertext encrypted in the principal's long-term key. This ciphertext could be used to conduct an off-line dictionary attack against the user's password.

*Credits: N/A

CVSS Scores

NISTv2 5.8

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-03-24 CVE Reserved
2015-05-25 CVE Published
2023-03-07 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (7)

URL	Tag	Source
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html	X_refsource_confirm
http://www.securityfocus.com/bid/74824	Vdb Entry

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8160	2020-01-21
http://www.ubuntu.com/usn/USN-2810-1	2020-01-21
https://github.com/krb5/krb5/commit/e3b5a5e5267818c97750b266df50b6a3d4649604	2020-01-21
https://access.redhat.com/security/cve/CVE-2015-2694	2015-11-19
https://bugzilla.redhat.com/show_bug.cgi?id=1216133	2015-11-19

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.12 Search vendor "Mit" for product "Kerberos 5" and version "1.12"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.12.1 Search vendor "Mit" for product "Kerberos 5" and version "1.12.1"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.12.2 Search vendor "Mit" for product "Kerberos 5" and version "1.12.2"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.12.3 Search vendor "Mit" for product "Kerberos 5" and version "1.12.3"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.13 Search vendor "Mit" for product "Kerberos 5" and version "1.13"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				1.13.1 Search vendor "Mit" for product "Kerberos 5" and version "1.13.1"		-		Affected