Bug 1747231 (CVE-2019-14369) - CVE-2019-14369 exiv2: Heap-based buffer over-read in Exiv2::PngImage::readMetadata() in pngimage.cpp
Summary: CVE-2019-14369 exiv2: Heap-based buffer over-read in Exiv2::PngImage::readMet...
Alias: CVE-2019-14369
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1747232
Blocks: 1747234
TreeView+ depends on / blocked
Reported: 2019-08-30 00:31 UTC by Pedro Sampaio
Modified: 2021-02-16 21:26 UTC (History)
3 users (show)

Fixed In Version:
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Clone Of:
Last Closed: 2019-09-27 12:45:38 UTC

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Description Pedro Sampaio 2019-08-30 00:31:59 UTC
Exiv2::PngImage::readMetadata() in pngimage.cpp in Exiv2 allows attackers to cause a denial of service (heap-based buffer over-read) via a crafted image file.

Upstream bug:


Comment 1 Pedro Sampaio 2019-08-30 00:32:10 UTC
Created exiv2 tracking bugs for this issue:

Affects: fedora-all [bug 1747232]

Comment 2 Riccardo Schirone 2019-09-24 14:23:08 UTC
Upstream fix:

same fix as CVE-2019-13504

Comment 3 Riccardo Schirone 2019-09-24 14:40:21 UTC
This bug has the same root cause as CVE-2019-13504. From bug 1729034 comment 4:
> When seeking in MemIo (code in MemIo::Impl::seek) the new position is not 
> properly checked, thus it is possible to move the current position beyond 
> the limits of the memory buffer. If a read is done later (code in MemIo::Impl::read) 
> the maximum number of bytes to read is computed by subtracting the current position 
> value from the buffer's size value. When these two values are implemented as
> unsigned values (e.g. size_t), the computation may wraparound and more data than
> what really available would be reported, making it possible to read beyond the 
> buffer's limits.

Comment 4 Riccardo Schirone 2019-09-24 14:42:07 UTC

This issue did not affect the versions of exiv2 as shipped with Red Hat Enterprise Linux 7, and 8 as variables MemIo::Impl::size_ and MemIo::Impl::idx_ are of type long, making it impossible to trigger the integer wraparound that would lead to an out-of-bound read.

Comment 5 Riccardo Schirone 2019-09-27 09:37:04 UTC
The flaw seems to be introduced in commit https://github.com/Exiv2/exiv2/commit/c72d16f4c402a8acc2dfe06fe3d58bf6cf99069e, where MemIo::Impl fields were changed from long to size_t.

Comment 6 Product Security DevOps Team 2019-09-27 12:45:38 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


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