Bug 1278373 (CVE-2015-5314) - CVE-2015-5314 hostapd: EAP-pwd missing last fragment length validation
Summary: CVE-2015-5314 hostapd: EAP-pwd missing last fragment length validation
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-5314
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1277868
TreeView+ depends on / blocked
 
Reported: 2015-11-05 11:12 UTC by Martin Prpič
Modified: 2021-02-17 04:44 UTC (History)
1 user (show)

Fixed In Version: hostapd 2.6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-11-05 11:25:46 UTC
Embargoed:


Attachments (Terms of Use)
EAP-pwd peer: Fix last fragment length validation (1.78 KB, text/plain)
2015-11-05 11:23 UTC, Martin Prpič
no flags Details
EAP-pwd server: Fix last fragment length validation (1.78 KB, text/plain)
2015-11-05 11:24 UTC, Martin Prpič
no flags Details

Description Martin Prpič 2015-11-05 11:12:07 UTC
The following flaw was reported in hostapd:

A vulnerability was found in EAP-pwd server and peer implementation used in hostapd and wpa_supplicant, respectively. When an incoming EAP-pwd message is fragmented, the remaining reassembly buffer length was not checked for the last fragment (but was checked for other fragments). This allowed a suitably constructed last fragment frame to try to add extra data that would go beyond the buffer. The length validation code in wpabuf_put_data() prevents an actual buffer write overflow from occurring, but this results in process termination.

For hostapd used with an internal EAP server and EAP-pwd enabled in the runtime configuration, this could allow a denial of service attack by an attacker within radio range of the AP device.

For hostapd used as a RADIUS server with EAP-pwd enabled in the runtime configuration, this could allow a denial of service attack by an attacker within radio range of any AP device that is authorized to use the RADIUS server.

Vulnerable versions/configurations:

hostapd v1.0-v2.5 with CONFIG_EAP_PWD=y in the build configuration (hostapd/.config) and EAP-pwd authentication server enabled in runtime configuration.

Possible workarounds:

- Remove CONFIG_EAP_PWD=y from build configuration

- Disable EAP-pwd in runtime configuration

The related issue in wpa_supplicant is filed under CVE-2015-5315.

External References:

http://w1.fi/security/2015-7/

Comment 1 Martin Prpič 2015-11-05 11:23:59 UTC
Created attachment 1090026 [details]
EAP-pwd peer: Fix last fragment length validation

Comment 2 Martin Prpič 2015-11-05 11:24:17 UTC
Created attachment 1090027 [details]
EAP-pwd server: Fix last fragment length validation

Comment 3 Martin Prpič 2015-11-05 11:25:46 UTC
The hostapd packages in Fedora are not built with the CONFIG_EAP_PWD configuration option and hence are not affected.


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