CVE-2015-5697: Infoleak
First published: Fri Jul 31 2015(Updated: )
In the md driver (drivers/md/md.c) of the Linux kernel it’s possible to request a bitmap file for a device using get_bitmap_file(), which uses kmalloc(). When bitmap is disabled, only the first byte of the buffer is initialized to zero, and then the whole buffer is copied in user space. It's possible to read up to 4095 bytes of kernel space memory from user space. This results in local kernel information leak. Upstream patch: <a href="http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=77ba0569d4c8389c0a2162ab0c7c16a6f3b199e4">http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=77ba0569d4c8389c0a2162ab0c7c16a6f3b199e4</a> CVE assignment: <a href="http://seclists.org/oss-sec/2015/q3/235">http://seclists.org/oss-sec/2015/q3/235</a>
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=4.1.5 | |
| debian/linux | 5.10.223-1 6.1.106-3 6.1.99-1 6.10.9-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b6878d9e03043695dbf3fa1caa6dfc09db225b16
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/163661.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/163711.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/164137.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/164193.html
- http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00009.html
- http://www.debian.org/security/2015/dsa-3329
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.6
- http://www.openwall.com/lists/oss-security/2015/07/28/2
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://www.securityfocus.com/bid/76066
- http://www.securitytracker.com/id/1033211
- http://www.ubuntu.com/usn/USN-2731-1
- http://www.ubuntu.com/usn/USN-2732-1
- http://www.ubuntu.com/usn/USN-2748-1
- http://www.ubuntu.com/usn/USN-2749-1
- http://www.ubuntu.com/usn/USN-2751-1
- http://www.ubuntu.com/usn/USN-2752-1
- http://www.ubuntu.com/usn/USN-2777-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1249011
- https://github.com/torvalds/linux/commit/b6878d9e03043695dbf3fa1caa6dfc09db225b16
- https://launchpad.net/bugs/cve/CVE-2015-5697
- http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=77ba0569d4c8389c0a2162ab0c7c16a6f3b199e4
- http://seclists.org/oss-sec/2015/q3/235
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1249013
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b6878d9e03043695dbf3fa1caa6dfc09db225b16
- https://www.openwall.com/lists/oss-security/2015/07/28/2
- https://security-tracker.debian.org/tracker/CVE-2015-5697
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5697
- https://nvd.nist.gov/vuln/detail/CVE-2015-5697
- https://ubuntu.com/security/CVE-2015-5697
Frequently Asked Questions
What is the vulnerability ID of this vulnerability?
The vulnerability ID is CVE-2015-5697.
What is the severity of CVE-2015-5697?
The severity of CVE-2015-5697 is low.
What is the affected software for CVE-2015-5697?
The affected software for CVE-2015-5697 includes the Linux kernel versions before 4.1.6.
How can a local user exploit CVE-2015-5697?
A local user can exploit CVE-2015-5697 by making a GET_BITMAP_FILE ioctl call to obtain sensitive information from kernel memory.
Are there any remediation measures for CVE-2015-5697?
Yes, the remedy for CVE-2015-5697 is to update the Linux kernel to version 4.1.6 or later.
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