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

[grahamc]

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

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fixed:

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Upon Completion ...

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Info

Triage Indicator:

-needs-triage +roundup27 thread:0000000000003f5e

• 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:0000000000003f5e

Known CVEs: CVE-2017-6845

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Thu, 2 Mar 2017 16:35:37 +0000 "Agostino Sarubbo" <ago-at-gentoo.org>, 899078.172023536-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
==9554==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000004ca47d bp 0x7fff58eb6bb0 sp 0x7fff58eb6330 T0)
==9554==The signal is caused by a READ memory access.
==9554==Hint: address points to the zero page.
    #0 0x4ca47c in AddressIsPoisoned /tmp/portage/sys-devel/llvm-3.9.0-r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_mapping.h:321
    #1 0x4ca47c in QuickCheckForUnpoisonedRegion /tmp/portage/sys-devel/llvm-3.9.0-r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:43
    #2 0x4ca47c in __asan_memcpy /tmp/portage/sys-devel/llvm-3.9.0-r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:413
    #3 0x7f5fc924b58d in PoDoFo::PdfColor::operator=(PoDoFo::PdfColor const&) /tmp/portage/app-text/podofo-0.9.4/work/podofo-0.9.4/src/base/PdfColor.cpp:575:9
    #4 0x52d31f in GraphicsStack::TGraphicsStackElement::operator=(GraphicsStack::TGraphicsStackElement const&) /tmp/portage/app-text/podofo-0.9.4/work/podofo-0.9.4/tools/podofocolor/graphicsstack.h:46:29
    #5 0x52d31f in GraphicsStack::TGraphicsStackElement::TGraphicsStackElement(GraphicsStack::TGraphicsStackElement const&) /tmp/portage/app-text/podofo-0.9.4/work/podofo-0.9.4/tools/podofocolor/graphicsstack.h:41
    #6 0x52c46a in GraphicsStack::Push() /tmp/portage/app-text/podofo-0.9.4/work/podofo-0.9.4/tools/podofocolor/graphicsstack.cpp:40:27
    #7 0x522005 in ColorChanger::ReplaceColorsInPage(PoDoFo::PdfCanvas*) /tmp/portage/app-text/podofo-0.9.4/work/podofo-0.9.4/tools/podofocolor/colorchanger.cpp:187:35
    #8 0x51ed8e in ColorChanger::start() /tmp/portage/app-text/podofo-0.9.4/work/podofo-0.9.4/tools/podofocolor/colorchanger.cpp:120:15
    #9 0x51c06d in main /tmp/portage/app-text/podofo-0.9.4/work/podofo-0.9.4/tools/podofocolor/podofocolor.cpp:116:12
    #10 0x7f5fc7d3261f in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
    #11 0x428718 in _start (/usr/bin/podofocolor+0x428718)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/sys-devel/llvm-3.9.0-r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_mapping.h:321 in AddressIsPoisoned
==9554==ABORTING

Affected version:
0.9.4

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/00172-podofo-nullptr-PoDoFo-PdfColor-operator

Timeline:
2017-02-13: bug discovered
2017-03-02: bug reported to 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-podofopdfcoloroperator-pdfcolor-cpp

--
Agostino Sarubbo
Gentoo Linux Developer

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Mon, 13 Mar 2017 11:08:52 +0100 Agostino Sarubbo <ago-at-gentoo.org>, 1766778.V2EZuu2kuy@blackgate

On Thursday 02 March 2017 16:35:37 Agostino Sarubbo 
wrote:
> Permalink:
> https://blogs.gentoo.org/ago/2017/03/02/podofo-null-pointer-dereference-in-p
> odofopdfcoloroperator-pdfcolor-cpp

This is CVE-2017-6845

-- 
Agostino Sarubbo
Gentoo Linux Developer

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