CVE-2021-29623: Uninitialized variable bug in Exiv2
A read of uninitialized memory was found in Exiv2 versions v0.27.3 and earlier. The read of uninitialized memory is triggered when Exiv2 is used to read the metadata of a crafted image file. An attacker could potentially exploit the vulnerability to leak a few bytes of stack memory, if they can trick the victim into running Exiv2 on a crafted image file.
Reference:
https://github.com/Exiv2/exiv2/security/advisories/GHSA-6253-qjwm-3q4v
Upstream Patch:
https://github.com/Exiv2/exiv2/pull/1627
Other sources
Exiv2 is a C++ library and a command-line utility to read, write, delete and modify Exif, IPTC, XMP and ICC image metadata. A read of uninitialized memory was found in Exiv2 versions v0.27.3 and earlier. Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. The read of uninitialized memory is triggered when Exiv2 is used to read the metadata of a crafted image file. An attacker could potentially exploit the vulnerability to leak a few bytes of stack memory, if they can trick the victim into running Exiv2 on a crafted image file. The bug is fixed in version v0.27.4.
— MITRE
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2021-29623?
CVE-2021-29623 is categorized as a medium severity vulnerability due to its potential to leak sensitive information from uninitialized memory.
How do I fix CVE-2021-29623?
To fix CVE-2021-29623, upgrade Exiv2 to version 0.27.4 or later.
Which versions of Exiv2 are affected by CVE-2021-29623?
Exiv2 versions v0.27.3 and earlier are affected by CVE-2021-29623.
Can CVE-2021-29623 be exploited by an attacker?
Yes, CVE-2021-29623 can potentially be exploited by an attacker to leak a few bytes of stack memory.
What type of vulnerability is CVE-2021-29623?
CVE-2021-29623 is classified as a memory-related vulnerability due to the read of uninitialized memory.