Roundup: [oss-security] podofo: NULL pointer dereference in PoDoFo::PdfXObject::PdfXObject (PdfXObject.cpp)

[grahamc]

Here is a report from the oss-security mailing list for Vulnerability Roundup 27.

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Instructions:

Identification

Identify if we have the software, in 16.09, 17.03, and unstable. Then determine if we are vulnerable, and make a comment with your findings. It can also be helpful to specify if you think there is a patch, or if it can be fixed via a general update.

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unstable: we are not vulnerable (link to the package)
17.03: we are vulnerable (link to the package)
16.09: we don't have it packaged

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fixed:

release-16.09: abc123

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Upon Completion ...

• [ ] Update Graham's database

Info

Triage Indicator:

-needs-triage +roundup27 thread:0000000000003f61

• File Search: https://search.nix.gsc.io/?q=podofo&i=fosho&repos=nixos-nixpkgs
• GitHub Search: https://github.com/NixOS/nixpkgs/search?utf8=%E2%9C%93&q=podofo+in%3Apath&type=Code

Should the search term be changed from podofo? Suggest a new package search by commenting:

-suggested:podofo +suggested:correctPackageName thread:0000000000003f61

Known CVEs: CVE-2017-6848

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Thu, 2 Mar 2017 16:36:42 +0000 "Agostino Sarubbo" <ago-at-gentoo.org>, 393990.264830308-sendEmail@localhost

Description:
podofo is a C++ library to work with the PDF file format.

A fuzz on it discovered a null pointer dereference. The upstream project denies me to open a new ticket. So, I just will forward this on the -users mailing list.

The complete ASan output:

# podofocolor dummy $FILE foo
==21036==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fc5cfd94743 bp 0x7ffc1eaffe50 sp 0x7ffc1eaffd40 T0)
==21036==The signal is caused by a READ memory access.
==21036==Hint: address points to the zero page.
    #0 0x7fc5cfd94742 in PoDoFo::PdfXObject::PdfXObject(PoDoFo::PdfObject*) /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/src/doc/PdfXObject.cpp:264:74
    #1 0x529308 in ColorChanger::start() /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/tools/podofocolor/colorchanger.cpp:137:28
    #2 0x523b8d in main /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/tools/podofocolor/podofocolor.cpp:116:12
    #3 0x7fc5cd8d178f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
    #4 0x4300e8 in _start (/usr/bin/podofocolor+0x4300e8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/src/doc/PdfXObject.cpp:264:74 in PoDoFo::PdfXObject::PdfXObject(PoDoFo::PdfObject*)
==21036==ABORTING

Affected version:
0.9.5

Fixed version:
N/A

Commit fix:
N/A

Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
N/A

Reproducer:
https://github.com/asarubbo/poc/blob/master/00214-podofo-nullptr-PdfXObject-cpp

Timeline:
2017-03-01: bug discovered
2017-03-02: bug reported upstream
2017-03-02: blog post about the issue

Note:
This bug was found with American Fuzzy Lop.

Permalink:
https://blogs.gentoo.org/ago/2017/03/02/podofo-null-pointer-dereference-in-podofopdfxobjectpdfxobject-pdfxobject-cpp

--
Agostino Sarubbo
Gentoo Linux Developer

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Mon, 13 Mar 2017 11:12:54 +0100 Agostino Sarubbo <ago-at-gentoo.org>, 1742097.gFNMWqBDs8@blackgate

On Thursday 02 March 2017 16:36:42 Agostino Sarubbo wrote:
> Permalink:
> https://blogs.gentoo.org/ago/2017/03/02/podofo-null-pointer-dereference-in-p
> odofopdfxobjectpdfxobject-pdfxobject-cpp

This is CVE-2017-6848

-- 
Agostino Sarubbo
Gentoo Linux Developer

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