libtiff: Denial of Service -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2556
                   libtiff -- Improper Input Validation
                              12 October 2017

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

Product:           libtiff
Publisher:         FreeBSD
Operating System:  FreeBSD
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-13727 CVE-2017-13726 

Original Bulletin: 
   http://www.vuxml.org/freebsd/9b5a905f-e556-452f-a00c-8f070a086181.html

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than FreeBSD. It is recommended that administrators
         running libtiff check for an updated version of the software for 
         their operating system.

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libtiff -- Improper Input Validation

Affected packages
libtiff	<=	4.0.8
Details

VuXML ID	9b5a905f-e556-452f-a00c-8f070a086181
Discovery	2017-08-29
Entry	2017-10-10
libtiff developers report:

There is a reachable assertion abort in the function TIFFWriteDirectoryTagSubifd() in LibTIFF 4.0.8, related to tif_dirwrite.c and a SubIFD tag. A crafted input will lead to a remote denial of service attack.

There is a reachable assertion abort in the function TIFFWriteDirectorySec() in LibTIFF 4.0.8, related to tif_dirwrite.c and a SubIFD tag. A crafted input will lead to a remote denial of service attack.

[source]
References

CVE Name	CVE-2017-13726
CVE Name	CVE-2017-13727
URL	http://bugzilla.maptools.org/show_bug.cgi?id=2727
URL	http://bugzilla.maptools.org/show_bug.cgi?id=2728
URL	http://www.securityfocus.com/bid/100524

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