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VuXML IDDescription
107c7a76-beaa-11eb-b87a-901b0ef719abFreeBSD -- Missing message validation in libradius(3)

Problem Description:

libradius did not perform sufficient validation of received messages.

rad_get_attr(3) did not verify that the attribute length is valid before subtracting the length of the Type and Length fields. As a result, it could return success while also providing a bogus length of SIZE_T_MAX - 2 for the Value field.

When processing attributes to find an optional authenticator, is_valid_response() failed to verify that each attribute length is non-zero and could thus enter an infinite loop.

Impact:

A server may use libradius(3) to process messages from RADIUS clients. In this case, a malicious client could trigger a denial-of-service in the server. A client using libradius(3) to process messages from a server is susceptible to the same problem.

The impact of the rad_get_attr(3) bug depends on how the returned length is validated and used by the consumer. It is possible that libradius(3) applications will crash or enter an infinite loop when calling rad_get_attr(3) on untrusted RADIUS messages.


Discovery 2021-05-27
Entry 2021-05-27
FreeBSD
ge 13.0 lt 13.0_1

ge 12.2 lt 12.2_7

ge 11.4 lt 11.4_10

CVE-2021-29629
SA-21:12.libradius