Re: [MIB-DOCTORS] Readable and MAXACCESS
Glenn Mansfield Keeni <glenn@cysols.com> Fri, 14 September 2018 23:46 UTC
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From: Glenn Mansfield Keeni <glenn@cysols.com>
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Date: Sat, 15 Sep 2018 08:45:44 +0900
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Subject: Re: [MIB-DOCTORS] Readable and MAXACCESS
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Hi, > Yes. The sensitivity of indexes needs to be considered in > the formulation of an access control policy. Thanks. Agreement on that. But I think that there is an additional issue. Even with appropriate access control policy, if appropriate encryption is not used index objects may reveal/leak information (to an eavesdropper) . e.g. in the tcpConnTable the index objects tcpConnLocalAddress, tcpConnLocalPort, tcpConnRemAddress, tcpConnRemPort reveal the existence of a connection/conversation. Or, in the usmUserTable the index usmUserName reveals the userName. (Note that userName has MAX-ACCESS not-accessible.) So, does the following sentence in the The Security Guidelines for IETF MIB modules needs rewording? >> Some of the readable objects in this MIB module (i.e., objects >> with a MAX-ACCESS other than not-accessible) may be considered >> sensitive or vulnerable in some network environments. Would the following be appropriate ? Some of the readable objects in this MIB module (i.e., objects with a MAX-ACCESS other than not-accessible and objects that are visible as indices) may be considered sensitive or vulnerable in some network environments. Glenn On 2018/09/15 6:19, Randy Presuhn wrote: > Hi - > > On 9/14/2018 4:10 AM, Glenn Mansfield Keeni wrote: >> Hi, >> The Security Guidelines for IETF MIB modules says >> Some of the readable objects in this MIB module (i.e., objects >> with a MAX-ACCESS other than not-accessible) may be considered >> sensitive or vulnerable in some network environments. >> >> This seems to imply that objects that have MAX-ACCESS not-accessible >> are not "readable". But the objects can very well be "read" from the >> index, if the MO is an index object. >> Then "not-accessible" objects too may be sensitive or vulnerable ? > > Yes. The sensitivity of indexes needs to be considered in > the formulation of an access control policy. > > Randy > > _______________________________________________ > MIB-DOCTORS mailing list > MIB-DOCTORS@ietf.org > https://www.ietf.org/mailman/listinfo/mib-doctors >
- [MIB-DOCTORS] Readable and MAXACCESS Glenn Mansfield Keeni
- Re: [MIB-DOCTORS] Readable and MAXACCESS Randy Presuhn
- Re: [MIB-DOCTORS] Readable and MAXACCESS Glenn Mansfield Keeni
- Re: [MIB-DOCTORS] Readable and MAXACCESS Randy Presuhn
- Re: [MIB-DOCTORS] Readable and MAXACCESS Glenn Mansfield Keeni
- Re: [MIB-DOCTORS] Readable and MAXACCESS Juergen Schoenwaelder
- Re: [MIB-DOCTORS] Readable and MAXACCESS Glenn Mansfield Keeni