CVE-2017-15265: Race Condition
First published: Fri Oct 13 2017(Updated: )
A use-after-free vulnerability was found at creating and deleting a port via an ioctl on /dev/snd/seq. The snd_seq_create_port() function creates a port object and returns its pointer, but it doesn't take a refcount and can be deleted immediately by another thread. Meanwhile, snd_seq_ioctl_create_port() still calls the function snd_seq_system_client_ev_port_start() with the created port object that is being deleted, which triggers use-after-free. An attacker can race this use for memory corruption or possibly privilege escalation. At the time of writing, the permissions on the device file required a local console user to be issue the ioctl to allow for the exploit to work correctly. Remote users accessing the system via a shell were not granted permissions to issue an IOCTL that can trigger this condition. References: <a href="http://seclists.org/oss-sec/2017/q4/58">http://seclists.org/oss-sec/2017/q4/58</a> <a href="http://mailman.alsa-project.org/pipermail/alsa-devel/2017-October/126292.html">http://mailman.alsa-project.org/pipermail/alsa-devel/2017-October/126292.html</a> An upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71105998845fb012937332fe2e806d443c09e026">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71105998845fb012937332fe2e806d443c09e026</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Android | ||
| Linux Kernel | <3.2.95 | |
| Linux Kernel | >=3.3<3.10.108 | |
| Linux Kernel | >=3.11<3.16.50 | |
| Linux Kernel | >=3.17<3.18.76 | |
| Linux Kernel | >=3.19<4.1.46 | |
| Linux Kernel | >=4.2<4.4.93 | |
| Linux Kernel | >=4.5<4.9.57 | |
| Linux Kernel | >=4.10<4.13.8 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=71105998845fb012937332fe2e806d443c09e026
- http://mailman.alsa-project.org/pipermail/alsa-devel/2017-October/126292.html
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.8
- http://www.openwall.com/lists/oss-security/2017/10/11/3
- http://www.securityfocus.com/bid/101288
- http://www.securitytracker.com/id/1039561
- https://access.redhat.com/errata/RHSA-2018:0676
- https://access.redhat.com/errata/RHSA-2018:1062
- https://access.redhat.com/errata/RHSA-2018:1130
- https://access.redhat.com/errata/RHSA-2018:1170
- https://access.redhat.com/errata/RHSA-2018:2390
- https://access.redhat.com/errata/RHSA-2018:3822
- https://access.redhat.com/errata/RHSA-2018:3823
- https://bugzilla.suse.com/show_bug.cgi?id=1062520
- https://github.com/torvalds/linux/commit/71105998845fb012937332fe2e806d443c09e026
- https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0
- https://lists.debian.org/debian-lts-announce/2017/12/msg00004.html
- https://source.android.com/security/bulletin/2018-02-01
- https://usn.ubuntu.com/3698-1/
- https://usn.ubuntu.com/3698-2/
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://launchpad.net/bugs/cve/CVE-2017-15265
- http://seclists.org/oss-sec/2017/q4/58
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71105998845fb012937332fe2e806d443c09e026
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1501880
- https://www.theregister.co.uk/2017/10/15/advanced_linux_sound_architecture_vulnerable_to_privilege_escalation/
- http://redhat.com/rhel/lifecycle
- https://access.redhat.com/solutions/41278
- https://bugzilla.redhat.com/show_bug.cgi?id=1501878
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/sound/?h=v4.4.103&id=23709ae9b61429502fcd4686e7a97333f3b3544a
- https://source.android.com/docs/security/bulletin/2018-02-01 (Advisory)
- https://security-tracker.debian.org/tracker/CVE-2017-15265
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15265
- https://nvd.nist.gov/vuln/detail/CVE-2017-15265
- https://ubuntu.com/security/CVE-2017-15265
Frequently Asked Questions
What is the severity of CVE-2017-15265?
CVE-2017-15265 is classified as a high-severity use-after-free vulnerability that can lead to potential system crashes or arbitrary code execution.
How do I fix CVE-2017-15265?
To fix CVE-2017-15265, upgrade to a patched version of the Linux kernel, specifically versions 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, 6.12.10-1, or 6.12.11-1.
Which Linux Kernel versions are affected by CVE-2017-15265?
CVE-2017-15265 affects Linux Kernel versions prior to 3.2.95 and versions between 3.3 and 4.13.8.
What causes CVE-2017-15265?
CVE-2017-15265 is caused by the snd_seq_create_port() function not maintaining reference counts, allowing immediate deletion of a port object by another thread.
Is CVE-2017-15265 specific to any particular operating system?
CVE-2017-15265 primarily affects the Linux kernel and, by extension, Linux-based operating systems like Android.
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