FreeIPA up to 4.11.1/4.12.0 Delegation Rule access control

Summaryinfo

A vulnerability described as critical has been identified in FreeIPA up to 4.11.1/4.12.0. Affected by this issue is some unknown functionality of the component Delegation Rule Handler. Executing a manipulation can lead to access control. The identification of this vulnerability is CVE-2024-2698. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in FreeIPA up to 4.11.1/4.12.0 and classified as critical. This vulnerability affects an unknown code block of the component Delegation Rule Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability was found in FreeIPA in how the initial implementation of MS-SFU by MIT Kerberos was missing a condition for granting the "forwardable" flag on S4U2Self tickets. Fixing this mistake required adding a special case for the check_allowed_to_delegate() function: If the target service argument is NULL, then it means the KDC is probing for general constrained delegation rules and not checking a specific S4U2Proxy request. In FreeIPA 4.11.0, the behavior of ipadb_match_acl() was modified to match the changes from upstream MIT Kerberos 1.20. However, a mistake resulting in this mechanism applies in cases where the target service argument is set AND where it is unset. This results in S4U2Proxy requests being accepted regardless of whether or not there is a matching service delegation rule.

The advisory is shared for download at bugzilla.redhat.com. This vulnerability was named CVE-2024-2698 since 03/19/2024. The exploitation appears to be easy. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 227907 (Linux Distros Unpatched Vulnerability : CVE-2024-2698), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.11.2 or 4.12.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (227907) and EUVD (EUVD-2024-27644). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Directory Service Software

Name

• FreeIPA

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.11.0
• 4.11.1
• 4.12.0

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion