kldstat: Access Privileged Data -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3130
                 FreeBSD -- Information leak in kldstat(2)
                              7 December 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kldstat
Publisher:         FreeBSD
Operating System:  FreeBSD
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1088  

Reference:         ESB-2017.2914

Original Bulletin: 
   http://www.vuxml.org/freebsd/759059ac-dab3-11e7-b5af-a4badb2f4699.html

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FreeBSD -- Information leak in kldstat(2)

Affected packages

11.1 <= FreeBSD-kernel < 11.1_4
11.0 <= FreeBSD-kernel < 11.0_15
10.4 <= FreeBSD-kernel < 10.4_3
10.3 <= FreeBSD-kernel < 10.3_24

Details

VuXML ID 759059ac-dab3-11e7-b5af-a4badb2f4699

Discovery 2017-11-15

Entry 2017-12-06

Problem Description:

The kernel does not properly clear the memory of the kld_file_stat structure 
before filling the data. Since the structure filled by the kernel is allocated
on the kernel stack and copied to userspace, a leak of information from the 
kernel stack is possible.

Impact:

Some bytes from the kernel stack can be observed in userspace.

References

CVE Name CVE-2017-1088

FreeBSD Advisory SA-17:10.kldstat

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===========================================================================
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