CVE-2017-7477: Buffer Overflow
First published: Tue Apr 25 2017(Updated: )
A heap overflow vulnerability was found in the Linux kernel in macsec module. Specifying MAX_SKB_FRAGS + 1 and using NETIF_F_FRAGLIST which calls skb_to_sgvec will overflow the heap. Upstream patches: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=4d6fa57b4dab0d77f4d8e9d9c73d1e63f6fe8fee">https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=4d6fa57b4dab0d77f4d8e9d9c73d1e63f6fe8fee</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5294b83086cc1c35b4efeca03644cf9d12282e5b">https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5294b83086cc1c35b4efeca03644cf9d12282e5b</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.6<4.9.28 | |
| Linux Linux kernel | >=4.10<4.10.16 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
Remedy
Blacklist the MACsec kernel module
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Reference Links
- http://www.securityfocus.com/bid/98014
- http://www.securitytracker.com/id/1038500
- https://access.redhat.com/errata/RHSA-2017:1615
- https://access.redhat.com/errata/RHSA-2017:1616
- https://bugzilla.redhat.com/show_bug.cgi?id=1445207
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=4d6fa57b4dab0d77f4d8e9d9c73d1e63f6fe8fee
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5294b83086cc1c35b4efeca03644cf9d12282e5b
- https://launchpad.net/bugs/cve/CVE-2017-7477
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1445208
- http://seclists.org/oss-sec/2017/q2/119
- http://www.openwall.com/lists/oss-security/2017/04/24/4
- https://lkml.org/lkml/2017/4/21/689
- https://www.openwall.com/lists/oss-security/2017/04/25/4
- https://git.kernel.org/linus/4d6fa57b4dab0d77f4d8e9d9c73d1e63f6fe8fee
- https://git.kernel.org/linus/5294b83086cc1c35b4efeca03644cf9d12282e5b
- https://security-tracker.debian.org/tracker/CVE-2017-7477
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7477
- https://nvd.nist.gov/vuln/detail/CVE-2017-7477
- https://ubuntu.com/security/CVE-2017-7477
Frequently Asked Questions
What is CVE-2017-7477?
CVE-2017-7477 is a vulnerability in the MACsec module in the Linux kernel that allows attackers to cause a denial of service or possibly have other impacts.
How severe is CVE-2017-7477?
CVE-2017-7477 has a severity rating of high (7 out of 10).
Which versions of Linux kernel are affected by CVE-2017-7477?
CVE-2017-7477 affects Linux kernel versions up to 4.10.12.
How can I fix CVE-2017-7477?
To fix CVE-2017-7477, you should update your Linux kernel to a version beyond 4.10.12 or apply the necessary patches provided by your Linux distribution.
Where can I find more information about CVE-2017-7477?
You can find more information about CVE-2017-7477 in the references section: [link1](https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=4d6fa57b4dab0d77f4d8e9d9c73d1e63f6fe8fee), [link2](https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5294b83086cc1c35b4efeca03644cf9d12282e5b), [link3](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1445208).
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