CVE-2021-3420: Integer Overflow
First published: Tue Mar 02 2021(Updated: )
A flaw was found in newlib in versions prior to 4.0.0. Improper overflow validation in the memory allocation functions mEMALIGn, pvALLOc, nano_memalign, nano_valloc, nano_pvalloc could case an integer overflow, leading to an allocation of a small buffer and then to a heap-based buffer overflow.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/newlib | <4.0.0 | 4.0.0 |
| Amazon FreeRTOS | ||
| Apache NuttX | ||
| ARM CMSIS-RTOS2 | ||
| Arm Mbed OS | ||
| Arm Mbed ualloc | ||
| QNX | ||
| BlackBerry QNX OS for Safety | ||
| BlackBerry QNX OS for Medical | ||
| QNX | ||
| Mongoose OS | ||
| eCosCentric eCosPro RTOS | ||
| Google Cloud IoT Device SDK | ||
| MediaTek LinkIt SDK | ||
| Micrium OS | ||
| Micrium uC/OS | ||
| NXP MCUXpresso SDK | ||
| NXP MQX | ||
| newlib | ||
| RIOT OS | ||
| Samsung Tizen RT | ||
| TencentOS-tiny | ||
| Texas Instruments SimpleLink CC32XX | ||
| Texas Instruments SimpleLink MSP432E4 SDK | ||
| Texas Instruments SimpleLink CC13X2 SDK | ||
| Texas Instruments SimpleLink CC26XX | ||
| Texas Instruments SimpleLink CC32XX | ||
| uClibc | ||
| Wind River VxWorks | ||
| Zephyr Project RTOS | ||
| newlib | <4.0.0 | |
| Red Hat Fedora | =32 | |
| Red Hat Fedora | =33 | |
| Red Hat Fedora | =34 |
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Reference Links
- https://sourceware.org/git/?p=newlib-cygwin.git;a=commit;h=aa106b29a6a8a1b0df9e334704292cbc32f2d44e
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1934089
- https://bugzilla.redhat.com/show_bug.cgi?id=1934088
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AEBF6YHWFNCBW5A2ENSQ3Z56ELF4MTRE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AMK54N6UOPBFFX2YT32TWSAEFTHGSKAA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LSQZEUANAWBBAOC4TF5PTPJVLMUR7SFD/
- https://www.cisa.gov/news-events/ics-advisories/icsa-21-119-04 (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AEBF6YHWFNCBW5A2ENSQ3Z56ELF4MTRE/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQZEUANAWBBAOC4TF5PTPJVLMUR7SFD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AMK54N6UOPBFFX2YT32TWSAEFTHGSKAA/
Frequently Asked Questions
What is the severity of CVE-2021-3420?
The severity of CVE-2021-3420 is rated as high due to the potential for a heap-based buffer overflow, which can lead to system compromise.
How do I fix CVE-2021-3420?
To fix CVE-2021-3420, you should upgrade Newlib to version 4.0.0 or later.
Which versions of Newlib are affected by CVE-2021-3420?
Newlib versions prior to 4.0.0 are affected by CVE-2021-3420.
What types of systems are vulnerable to CVE-2021-3420?
CVE-2021-3420 affects systems running Newlib, including various embedded operating systems and frameworks.
Is CVE-2021-3420 related to memory management vulnerabilities?
Yes, CVE-2021-3420 involves improper overflow validation in memory allocation functions, leading to potential buffer overflows.
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