The eap_pwd_process function in eap_server/eap_server_pwd.c in hostapd 2.x before 2.6 does not validate that the reassembly buffer is large enough for the final fragment when used with (1) an internal EAP server or (2) a RADIUS server and EAP-pwd is enabled in a runtime configuration, which allows remote attackers to cause a denial of service (process termination) via a large final fragment in an EAP-pwd message.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| http://www.ubuntu.com/usn/USN-2808-1 | vendor advisory broken link |
| https://www.debian.org/security/2015/dsa-3397 | third party advisory vendor advisory |
| http://w1.fi/security/2015-7/eap-pwd-missing-last-fragment-length-validation.txt | mitigation vendor advisory |
| http://www.openwall.com/lists/oss-security/2015/11/10/10 | patch mailing list mitigation third party advisory |