Buffer overflow in Azure-Rtos Filex
CVE-2022-39343
Azure RTOS FileX is a FAT-compatible file system that’s fully integrated with Azure RTOS ThreadX. In versions before 6.2.0, the Fault Tolerant feature of Azure RTOS FileX includes integer under and overflows which may be exploited to achieve buffer overflow and modify memory contents. When a valid log file with correct ID and checksum is detected by the `_fx_fault_tolerant_enable` function an attempt to recover the previous failed write operation is taken by call of `_fx_fault_tolerant_apply_logs`. This function iterates through the log entries and performs required recovery operations. When properly crafted a log including entries of type `FX_FAULT_TOLERANT_DIR_LOG_TYPE` may be utilized to introduce unexpected behavior. This issue has been patched in version 6.2.0. A workaround to fix line 218 in fx_fault_tolerant_apply_logs.c is documented in the GHSA.
Vulnerability class: Buffer Overflow
EPSS: 0.008 (53.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Azure-rtos Filex — versions < 6.2.0
- Microsoft Azure_rtos_filex
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Exploit, Third Party Advisory, Mitigation)
- security-advisories@github.com (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-39343?
- CVE-2022-39343 is a medium-severity vulnerability in Azure-Rtos Filex, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.6/10. Published 2022-11-08.
- How severe is CVE-2022-39343?
- Medium severity. CVSS v3 base score is 5.6 out of 10.
- Is CVE-2022-39343 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.