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CVE-2017-1000112 Detail

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.


Severity



CVSS 4.0 Severity and Metrics:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.


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Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://seclists.org/oss-sec/2017/q3/277 Mailing List  Patch  Third Party Advisory 
http://www.debian.org/security/2017/dsa-3981 Third Party Advisory 
http://www.securityfocus.com/bid/100262 Third Party Advisory  VDB Entry 
http://www.securitytracker.com/id/1039162 Third Party Advisory  VDB Entry 
https://access.redhat.com/errata/RHSA-2017:2918 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2017:2930 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2017:2931 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2017:3200 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2019:1931 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2019:1932 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2019:4159 Third Party Advisory 
https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112 Third Party Advisory 
https://www.exploit-db.com/exploits/45147/ Third Party Advisory  VDB Entry 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') cwe source acceptance level NIST  

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Change History

10 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-1000112
NVD Published Date:
10/04/2017
NVD Last Modified:
06/07/2023
Source:
MITRE