Matvei,
Hard to say if the use of json-c 0.11 by GDAL trigger those
vulnerabilities, but you should assume they might be hit. I've filed
https://github.com/OSGeo/gdal/issues/4143 about that.
But you should be able to build GDAL any external recent json-c. The
internal copy has mostly changes to please our compiler warning changes,
nothing significant.
Even
Le 28/07/2021 à 09:28, Matvei Stefarov via gdal-dev a écrit :
Hello! I am new to the list, I hope that this is the right place to ask.
GDAL's geojson driver uses libjson, which is a fork of json-c 0.11. There have
been a couple security vulnerabilities patched in json-c since version 0.11.
These vulnerabilities are:
- CVE-2013-6370 (buffer overflow if size_t is larger than int)
- CVE-2013-6371 (hash collision denial of service)
- CVE-2020-12762 (integer overflow and out-of-bounds write via a large JSON
file)
The first two were patched in 0.12 by
https://github.com/json-c/json-c/commit/64e36901a0614bf64a19bc3396469c66dcd0b015,
and the last was patched by
https://github.com/json-c/json-c/commit/31243e4d1204ef78be34b0fcae73221eee6b83be.
I don't see similar changes applied to GDAL's fork of libjson, so it might
still be vulnerable.
I discovered this potential problem because my GDAL-based software was flagged
as vulnerable by static analysis tools
(https://www.synopsys.com/software-integrity/security-testing/software-composition-analysis.html).
This tool works likely detected the presence of
json_c_version/json_c_version_num functions, which currently return 0.11.
So my questions are:
- Does GDAL appear to be vulnerable to these CVEs out-of-the-box?
- Would it be practical to build GDAL against a newer version of json-c instead
of the bundled libjson -- or are there significant modifications in the fork?
Cheers,
Matvei Stefarov
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