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CVE-2017-1000112

7.0 · HIGH

Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch.

Published Oct 5, 2017CWE-362EPSS 20.80%

Overview

CVE-2017-1000112 is a high-severity vulnerability. It was published on October 5, 2017 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch. 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. A similar issue is present in IPv6 code. The bug was introduced in e89e9cf539a2 ("[IPv4/IPv6]: UFO Scatter-gather approach") on Oct 18 2005.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refseclists.org/oss-sec/2017/q3/277Refwww.debian.org/security/2017/dsa-3981Refwww.securityfocus.com/bid/100262Refwww.securitytracker.com/id/1039162Refaccess.redhat.com/errata/RHSA-2017:2918Refaccess.redhat.com/errata/RHSA-2017:2930Refaccess.redhat.com/errata/RHSA-2017:2931Refaccess.redhat.com/errata/RHSA-2017:3200Refaccess.redhat.com/errata/RHSA-2019:1931Refaccess.redhat.com/errata/RHSA-2019:1932

How CyberStrike helps

Frequently asked questions

What is CVE-2017-1000112?

CVE-2017-1000112 is a high-severity vulnerability. It was published on October 5, 2017 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2017-1000112?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2017-1000112?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-1000112?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-1000112 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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