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FreeIPA 4.10.1 Denial Of Service / Information Disclosure

FreeIPA 4.10.1 Denial Of Service / Information Disclosure
Posted Feb 22, 2024
Authored by Robb Gatica

FreeIPA version 4.10.1 has an issue where specially crafted HTTP requests potentially lead to denial of service or data exposure.

tags | exploit, web, denial of service, info disclosure
advisories | CVE-2024-1481
SHA-256 | ed1964cddf58cd1a3b007267cb1f6a3b11008a5d76ebdb87f9a639382cd73688

FreeIPA 4.10.1 Denial Of Service / Information Disclosure

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Summary:
Specially crafted HTTP requests can read files in the DC server. And use keytab files for authorization for different kerberos principals.

Tested FreeIPA version:
ipa-server-4.10.1

Details
The "user" parameter in the HTTP URI "/sip/session/login_password" is inserted into the "run" function from the file "ipautil.py". Then it is passed as an argument to the "subprocess.Popen". As a result, the following list is passed: "args=['/usr/bin/kinit', '{user params}', '-c', /run/ipa/ccaches/kinit_13704', '-T', '/run/ipa/ccaches/armor_13704', '-C', '-E']". If instead of "{user params}" there is a string "-V", then it will be taken as an argument for "kinit". As a result, remote attackers can use options such as "-t", "-X", "-S" or "-I" for DOS, or use the keytab file from the system to log in under participants without a password.

PoC (attached screenshots):
Simple request with "user=-H&password=0000000"
With multiple parameters "user=-Vkt&password=0000000"

Impact
Possible DOS, use keytab from system and read files on DC.

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