CVE-2019-3901

LOW

Description

A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs. As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8.

References

http://www.securityfocus.com/bid/89937

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3901

https://lists.debian.org/debian-lts-announce/2019/05/msg00041.html

https://lists.debian.org/debian-lts-announce/2019/05/msg00042.html

https://security.netapp.com/advisory/ntap-20190517-0005/

Details

Source: MITRE

Published: 2019-04-22

Updated: 2019-05-28

Type: CWE-362

Risk Information

CVSS v2.0

Base Score: 1.9

Vector: AV:L/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 3.4

Severity: LOW

CVSS v3.0

Base Score: 4.7

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 1

Severity: MEDIUM