CVE-2021-29457 Heap buffer overflow in Exiv2::Jp2Image::doWriteMetadata

What is CVE-2021-29457?

CVE-2021-29457 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 19 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. A heap buffer overflow was found in Exiv2 versions v0.27.3 and earlier. The heap overflow is triggered when Exiv2 is used to write metadata into a crafted image file. An attacker could potentially exploit the vulnerability to gain code execution, if they can trick the victim into running Exiv2 on a crafted image file. Note that this bug is only triggered when _writing_ the metadata, which is a less frequently used Exiv2 operation than _reading_ the metadata. For example, to trigger the bug in the Exiv2 command-line application, you need to add an extra command-line argument such as `insert`. The bug is fixed in version v0.27.4.

Weakness: CWE-122

Which versions are affected by CVE-2021-29457?

It affects 3 products.

Products include Debian Debian Linux, Exiv2 Exiv2, Fedoraproject Fedora.

How do I fix CVE-2021-29457?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-29457 being exploited?

There is no known exploitation of CVE-2021-29457 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-7206, CLEANSTART-2024-LL11119, CVE-2021-31291, DEBIAN-CVE-2021-29457, GHSA-v74w-h496-cgqm, UBUNTU-CVE-2021-29457.