Several vulnerabilities in the shared libraries which pdftopng depend on. Could you help upgrade to patch versions?

[andy201709]

Hi, @vinayak-mehta, @captn3m0, I'd like to report a vulnerability issue in pdftopng_0.2.3.

Dependency Graph between Python and Shared Libraries

Issue Description

As shown in the above dependency graph, pdftopng_0.2.3 directly or transitively depends on 8 C libraries (.so). However, I noticed that some C libraries are vulnerable, containing the following CVEs:
libexpat-64fa60ba.so.1.5.2 from C project expat(version:<=2.1.0) exposed 1 vulnerabilities:
CVE-2017-9233
libfontconfig-63352676.so.1.4.4 from C project fontconfig(version:<=2.11.0) exposed 1 vulnerabilities:
CVE-2016-5384
libfreetype-20bfc0cd.so.6.3.22 from C project freetype(version:<2.5.2) exposed 11 vulnerabilities:
CVE-2015-9381, CVE-2015-9383, CVE-2015-9382, CVE-2015-9290, CVE-2018-6942, CVE-2016-10328,CVE-2016-10244, CVE-2014-9747, CVE-2014-9746, CVE-2014-9745,CVE-2014-2241
libpng12-640ca796.so.0.49.0 from C project libpng(version:<1.2.54) exposed 11 vulnerabilities:
CVE-2019-17371, CVE-2011-3045, CVE-2014-9495, CVE-2013-7354, CVE-2013-7353, CVE-2017-12652, CVE-2015-8472, CVE-2016-10087, CVE-2016-3751, CVE-2015-0973, CVE-2015-8540

Furthermore, the vulnerable methods in the vulnerable shared libraries can be actually invoked by Python code. For instance, the following call chain can reach the vulnerable method(C code) png_inflate() in file libpng/pngrutil.c reported by CVE-2011-3045.

call chains-----
readpng2_decode_data()->png_process_data()->png_process_some_data()->png_push_read_chunk()->png_handle_iCCP()->png_decompress_chunk()->png_inflate()

Suggested Vulnerability Patch Versions

expat has fixed the vulnerabilities in versions >=2.2.1
fontconfig has fixed the vulnerabilities in versions >=2.12.1
freetype has fixed the vulnerabilities in versions >=2.9.1
libpng has fixed the vulnerabilities in versions >=1.6.32-48

Python build tools cannot report vulnerable C libraries, which may induce potential security issues to many downstream Python projects.
As a popular python package (pdftopng has 21,936 downloads per month), could you please upgrade the above shared libraries to their patch versions?

Thanks for your help~
Best regards,
Andy

[andy201709]

@captn3m0 ,thank you very much for your help to upgrade to patch version.
By the way, May I ask two more questions?

Do you realize these type of cross-language vulnerablity issues in the Python projects?
Do you use any tools to help report vulnerable C libraries for Python projects?

Best regards,
Andy

[captn3m0]

@andy201709 Is there a way to reach you over email or elsewhere? I'm looking at documenting these issues, and perhaps setting up a CI for the same - would like to understand your methodology.

[captn3m0]

cc @JoeGardner000 , @MikeWazoWski123