CVE-2017-1000112: Race Condition
First published: Tue Aug 08 2017(Updated: )
A memory corruption issue was found in the Linux kernel. When building a UFO packet with MSG_MORE __ip_append_data() calls ip_ufo_append_data() to append. However in between two send() calls, the append path can be switched from UFO to non-UFO one, which leads to a memory corruption. In case UFO packet lengths exceeds MTU, copy = maxfraglen - skb->len becomes negative on the non-UFO path and the branch to allocate new skb is taken. This triggers fragmentation and computation of fraggap = skb_prev->len - maxfraglen. Fraggap can exceed MTU, causing copy = datalen - transhdrlen - fraggap to become negative. Subsequently skb_copy_and_csum_bits() writes out-of-bounds. Introducing commit: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e89e9cf539a2">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e89e9cf539a2</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 4.19.249-2 4.19.289-2 5.10.197-1 5.10.205-2 6.1.66-1 6.1.69-1 6.5.13-1 6.6.9-1 | |
| Linux kernel | >=2.6.15<3.10.108 | |
| Linux kernel | >=3.11<3.16.47 | |
| Linux kernel | >=3.17<3.18.65 | |
| Linux kernel | >=3.19<4.4.82 | |
| Linux kernel | >=4.5<4.9.43 | |
| Linux kernel | >=4.10<4.12.7 |
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Reference Links
- http://seclists.org/oss-sec/2017/q3/277
- http://www.debian.org/security/2017/dsa-3981
- http://www.securityfocus.com/bid/100262
- http://www.securitytracker.com/id/1039162
- https://access.redhat.com/errata/RHSA-2017:2918
- https://access.redhat.com/errata/RHSA-2017:2930
- https://access.redhat.com/errata/RHSA-2017:2931
- https://access.redhat.com/errata/RHSA-2017:3200
- https://access.redhat.com/errata/RHSA-2019:1931
- https://access.redhat.com/errata/RHSA-2019:1932
- https://access.redhat.com/errata/RHSA-2019:4159
- https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112
- https://www.exploit-db.com/exploits/45147/
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e89e9cf539a2
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1480465
- https://access.redhat.com/solutions/2127401
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=85f1bd9a7b5a79d5baa8bf44af19658f7bf77bfa
- https://bugzilla.redhat.com/show_bug.cgi?id=1479307
- https://git.kernel.org/linus/e89e9cf539a28df7d0eb1d0a545368e9920b34ac
- https://git.kernel.org/linus/85f1bd9a7b5a79d5baa8bf44af19658f7bf77bfa
- https://security-tracker.debian.org/tracker/CVE-2017-1000112
Frequently Asked Questions
What is the severity of CVE-2017-1000112?
CVE-2017-1000112 has been classified as a high-severity vulnerability due to the potential for memory corruption.
How do I fix CVE-2017-1000112?
To remediate CVE-2017-1000112, you should upgrade to a patched version of the Linux kernel, specifically versions 4.19.249-2, 5.10.197-1, or later.
Which Linux kernel versions are affected by CVE-2017-1000112?
CVE-2017-1000112 affects Linux kernel versions between 2.6.15 and 4.12.7.
What can happen if I am vulnerable to CVE-2017-1000112?
If your system is vulnerable to CVE-2017-1000112, it could lead to memory corruption that may be exploited by attackers to cause system instability or execute arbitrary code.
Is CVE-2017-1000112 specific to a certain distribution of Linux?
No, CVE-2017-1000112 is a vulnerability found in the Linux kernel and can affect multiple distributions that utilize the affected kernel versions.
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