CVE-2017-7495: Infoleak
First published: Fri May 12 2017(Updated: )
A flaw was found in the kernels implementation of ext4 for filesystems mounted with data=ordered mode. Stale data from recently allocated blocks may appear in newly created blocks in files when a system is 'power reset'. This may allow an attacker to gain information about file contents being written to disk when the system was being reset. This issue only affects regular write()'s and not when an application is using direct IO. In testing, the amount of stale-data leakage is at maximum the amount of outstanding delayed journal transactions to the underlying device since the last commit (defaulting to 5 seconds, but tunable/exasperated with commit=nrsec mount option).
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Android | ||
| Linux Kernel | <=4.6.1 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.2
- http://www.openwall.com/lists/oss-security/2017/05/15/2
- http://www.securityfocus.com/bid/98491
- https://bugzilla.redhat.com/show_bug.cgi?id=1450261
- https://github.com/torvalds/linux/commit/06bd3c36a733ac27962fea7d6f47168841376824
- https://source.android.com/security/bulletin/2017-09-01
- https://launchpad.net/bugs/cve/CVE-2017-7495
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824
- http://seclists.org/oss-sec/2017/q2/259
- https://source.android.com/docs/security/bulletin/2017-09-01 (Advisory)
- https://git.kernel.org/linus/06bd3c36a733ac27962fea7d6f47168841376824
- https://security-tracker.debian.org/tracker/CVE-2017-7495
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7495
- https://nvd.nist.gov/vuln/detail/CVE-2017-7495
- https://ubuntu.com/security/CVE-2017-7495
Frequently Asked Questions
What is the vulnerability ID of this security vulnerability?
The vulnerability ID of this security vulnerability is CVE-2017-7495.
What is the severity of CVE-2017-7495?
The severity of CVE-2017-7495 is high.
What software is affected by CVE-2017-7495?
The Linux kernel versions before 4.6.2 with ext4 data=ordered mode are affected by CVE-2017-7495.
How can I fix CVE-2017-7495?
To fix CVE-2017-7495, update your Linux kernel version to 4.7 or higher.
Where can I find more information about CVE-2017-7495?
You can find more information about CVE-2017-7495 at the following references: [http://www.securityfocus.com/bid/98491](http://www.securityfocus.com/bid/98491), [https://bugzilla.redhat.com/show_bug.cgi?id=1450261](https://bugzilla.redhat.com/show_bug.cgi?id=1450261), [http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824](http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824)
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