[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Tue, 1 Dec 2020 13:51:58 +0800
From: butt3rflyh4ck <butterflyhuangxx@...il.com>
To: oss-security@...ts.openwall.com
Subject: Linux Kernel: ALSA: use-after-free Write in snd_rawmidi_kernel_write1
Hi,
I reported a use-after-free bug in snd_rawmidi_kernel_write1 in
sound/core/rawmidi.c months ago. And I reproduced it in the latest version
linux-5.7.0 at that time.
Description:
It was found that the raw midi kernel driver does not protect
against concurrent access which leads to a use-after-free in
snd_rawmidi_kernel_read1() and snd_rawmidi_kernel_write1() in rawmidi.c
file.
A malicious local attacker could possibly use this for privilege
escalation.
Root Cause:
The rawmidi core allows user to resize the runtime buffer via ioctl,
and this may lead to UAF when performed during concurrent reads or writes:
the read/write functions unlock the runtime lock temporarily during copying
form/to user-space,
and that's the race window.
Patch for this issue:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1f6e3c818dd734c30f6a7eeebf232ba2cf3181d
CVE assigned:
not assigned.
Timeline:
*2020/5/7 - Vulnerability reported to security@...nel.org.
*2020/5/7 - Vulnerability confirmed and patched.
*2020/5/18 - Request a CVE ID via https://cveform.mitre.org/
*2020/11/18 - CVE Request responded but not assigned.
*2020/11/18 - Reported to Red Hat.
*2020/12/1 - Opened on oss -security@...ts.openwall.com
Credit:
This issue was discovered by the ADLab of venustech.
Regards.
butt3rflyh4ck.
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
