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.
Example:
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
IMPORTANT: If you believe there are possibly related issues, bring them up on the parent issue!
Patching
Start by commenting on this issue saying you're working on a patch. This way, we don't duplicate work.
If you open a pull request, tag this issue and the master issue for the roundup.
If you commit the patch directly to a branch, please leave a comment on this issue with the branch and the commit hash, example:
Thu, 2 Mar 2017 16:34:17 +0000 "Agostino Sarubbo" , 201613.082873763-sendEmail@localhost
Description:
podofo is a C++ library to work with the PDF file format.
A fuzz on it discovered a null pointer access. 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
==18954==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000052302d bp 0x7fc24b8e2000 sp 0x7ffcaaf21810 T0)
==18954==The signal is caused by a READ memory access.
==18954==Hint: address points to the zero page.
#0 0x52302c in getVtablePrefix /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cc:198
#1 0x52302c in __ubsan::checkDynamicType(void*, void*, unsigned long) /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cc:221
#2 0x521082 in HandleDynamicTypeCacheMiss /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/ubsan/ubsan_handlers_cxx.cc:37
#3 0x521922 in __ubsan_handle_dynamic_type_cache_miss /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/ubsan/ubsan_handlers_cxx.cc:87
#4 0x538eb2 in ColorChanger::GetColorFromStack(int, std::vector<PoDoFo::PdfVariant, std::allocator >&) /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/tools/podofocolor/colorchanger.cpp:430:33
#5 0x530d50 in ColorChanger::ProcessColor(ColorChanger::EKeywordType, int, std::vector<PoDoFo::PdfVariant, std::allocator >&, GraphicsStack&)
/tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/tools/podofocolor/colorchanger.cpp:449:28
#6 0x52c2a9 in ColorChanger::ReplaceColorsInPage(PoDoFo::PdfCanvas*) /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/tools/podofocolor/colorchanger.cpp:214:31
#7 0x526921 in ColorChanger::start() /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/tools/podofocolor/colorchanger.cpp:120:15
#8 0x523b8d in main /tmp/portage/app-text/podofo-0.9.5/work/podofo-0.9.5/tools/podofocolor/podofocolor.cpp:116:12
#9 0x7fc2490df78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#10 0x4300e8 in _start (/usr/bin/podofocolor+0x4300e8)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cc:198 in getVtablePrefix
==18954==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/00217-podofo-nullptr-colorchanger-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-colorchangergetcolorfromstack-colorchanger-cpp
--
Agostino Sarubbo
Gentoo Linux Developer
Mon, 13 Mar 2017 11:06:39 +0100 Agostino Sarubbo , 1536479.pTyB5C28Yh@blackgate
On Thursday 02 March 2017 16:34:17 Agostino Sarubbo wrote:
> Permalink:
> https://blogs.gentoo.org/ago/2017/03/02/podofo-null-pointer-dereference-in-c
> olorchangergetcolorfromstack-colorchanger-cpp
This is CVE-2017-6842
--
Agostino Sarubbo
Gentoo Linux Developer
Here is a report from the oss-security mailing list for Vulnerability Roundup 27.
Skip to First Email
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.
Example:
IMPORTANT: If you believe there are possibly related issues, bring them up on the parent issue!
Patching
Start by commenting on this issue saying you're working on a patch. This way, we don't duplicate work.
If you open a pull request, tag this issue and the master issue for the roundup.
If you commit the patch directly to a branch, please leave a comment on this issue with the branch and the commit hash, example:
Skip to First Email
Upon Completion ...
Info
Triage Indicator:
Should the search term be changed from
podofo? Suggest a new package search by commenting:Known CVEs: CVE-2017-6842
Skip to End
Thu, 2 Mar 2017 16:34:17 +0000 "Agostino Sarubbo",
201613.082873763-sendEmail@localhostSkip to End
Mon, 13 Mar 2017 11:06:39 +0100 Agostino Sarubbo,
1536479.pTyB5C28Yh@blackgateSkip to End