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Heap Out-of-bound Read vulnerability #51

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@pokerfacett

Description

@pokerfacett

Description:

When the zone file is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the memcpy is copied, the 0xfe - ldns_rdf_size(salt_rdf) byte data can be copied, causing heap information leakage.
Vulnerability location:
image

fuzz log:

INFO-w100wcrash.docx

fuzz payload:

w100wcrash-8f078e69e2781bbc4811a12d51df1c8674672306.txt

Repaire Suggestion:

image

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