Vulnerability · Published Mar 26, 2021 · Assigned by freebsd

CVE-2020-25578

Medium 5.3

In plain English

A medium-severity security flaw in FreeBSD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.3% (higher than 83% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS NVD)5.3Medium

Exploit odds (30 days)2.3%top 16.5% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack tooling1Public PoC

Official description

In FreeBSD 12.2-STABLE before r368969, 11.4-STABLE before r369047, 12.2-RELEASE before p3, 12.1-RELEASE before p13 and 11.4-RELEASE before p7 several file systems were not properly initializing the d_off field of the dirent structures returned by VOP_READDIR. In particular, tmpfs(5), smbfs(5), autofs(5) and mqueuefs(5) were failing to do so. As a result, eight uninitialized kernel stack bytes may be leaked to userspace by these file systems.

Affected products (as reported)

Vendor	Product	Versions
n/a	FreeBSD	FreeBSD 12.2-RELEASE before p3, 12.1-RELEASE before p13, 11.4-RELEASE before p7

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-21:01.fsdisclosure.asc x_refsource_MISC
https://security.netapp.com/advisory/ntap-20210423-0002/ x_refsource_CONFIRM