Buffer overflow in Freebsd
CVE-2023-5941
In versions of FreeBSD 12.4-RELEASE prior to 12.4-RELEASE-p7 and FreeBSD 13.2-RELEASE prior to 13.2-RELEASE-p5 the __sflush() stdio function in libc does not correctly update FILE objects' write space members for write-buffered streams when the write(2) system call returns an error. Depending on the nature of an application that calls libc's stdio functions and the presence of errors returned from the write(2) system call (or an overridden stdio write routine) a heap buffer overflow may occur. Such overflows may lead to data corruption or the execution of arbitrary code at the privilege level of the calling program.
EPSS: 0.011 (61.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Freebsd — versions 13.2, 13.2-RELEASE, 12.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secteam@freebsd.org (vendor-advisory, Vendor Advisory)
- secteam@freebsd.org
Frequently asked questions
- What is CVE-2023-5941?
- CVE-2023-5941 is a critical-severity vulnerability in Freebsd, classified under Incorrect Calculation of Buffer Size. CVSS score: 9.8/10. Published 2023-11-08.
- How severe is CVE-2023-5941?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2023-5941 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.