CVE-2014-2523: Input Validation
First published: Mon Mar 17 2014(Updated: )
Description of the problem: Some occurences in the netfilter tree use skb_header_pointer() in the following way ... struct dccp_hdr _dh, *dh; ... skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); ... where dh itself is a pointer that is being passed as the copy buffer. Instead, we need to use &_dh as the forth argument so that we're copying the data into an actual buffer that sits on the stack. A remote attacker could use this flaw to crash the system or, potentially, escalate their privileges on the system. References: <a href="http://www.openwall.com/lists/oss-security/2014/03/17/3">http://www.openwall.com/lists/oss-security/2014/03/17/3</a> Introduced by: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2bc780499aa3">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2bc780499aa3</a> Upstream fix: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b22f5126a24b">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b22f5126a24b</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <3.2.57 | |
| Linux Kernel | >=3.3<3.4.86 | |
| Linux Kernel | >=3.5<3.10.36 | |
| Linux Kernel | >=3.11<3.12.17 | |
| Linux Kernel | >=3.13.0<3.13.9 | |
| Ubuntu Linux | =10.04 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 |
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Reference Links
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b22f5126a24b3b2f15448c3f2a254fc10cbc2b92
- http://secunia.com/advisories/57446
- http://twitter.com/grsecurity/statuses/445496197399461888
- http://www.openwall.com/lists/oss-security/2014/03/17/7
- http://www.securityfocus.com/bid/66279
- http://www.securitytracker.com/id/1029945
- http://www.ubuntu.com/usn/USN-2173-1
- http://www.ubuntu.com/usn/USN-2174-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1077343
- https://exchange.xforce.ibmcloud.com/vulnerabilities/91910
- https://github.com/torvalds/linux/commit/b22f5126a24b3b2f15448c3f2a254fc10cbc2b92
- https://launchpad.net/bugs/cve/CVE-2014-2523
- http://www.openwall.com/lists/oss-security/2014/03/17/3
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2bc780499aa3
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b22f5126a24b
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1077350
- https://odesk.by/archives/2107#more-2107
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1077343#c8
- https://rhn.redhat.com/errata/RHSA-2014-0439.html
- https://rhn.redhat.com/errata/RHSA-2014-0475.html
- https://rhn.redhat.com/errata/RHSA-2014-0520.html
- https://rhn.redhat.com/errata/RHSA-2014-0593.html
- https://rhn.redhat.com/errata/RHSA-2014-0634.html
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=b22f5126a24b3b2f15448c3f2a254fc10cbc2b92
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/nf_conntrack_proto_dccp.c?id=b22f5126a24b3b2f15448c3f2a254fc10cbc2b92
- https://security-tracker.debian.org/tracker/CVE-2014-2523
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2523
- https://nvd.nist.gov/vuln/detail/CVE-2014-2523
- https://ubuntu.com/security/CVE-2014-2523
Frequently Asked Questions
What is the severity of CVE-2014-2523?
CVE-2014-2523 is classified as a medium severity vulnerability that can potentially lead to a denial of service due to incorrect handling of memory in the netfilter tree.
How do I fix CVE-2014-2523?
To fix CVE-2014-2523, you should upgrade your Linux Kernel to a version that is not affected, specifically versions later than 3.13.9 or any fixed package version like 5.10.223-1.
What versions of the Linux Kernel are affected by CVE-2014-2523?
CVE-2014-2523 affects Linux Kernel versions from 3.2.57 up to 3.13.9 and includes several versions in between.
Is Ubuntu Linux affected by CVE-2014-2523?
Yes, Ubuntu Linux version 10.04 is affected by CVE-2014-2523 and requires updating to a patched kernel version.
What components are involved in CVE-2014-2523?
CVE-2014-2523 involves the skb_header_pointer function within the netfilter tree, which improperly manages memory pointers.
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