CVE-2017-1000112

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Summary

CVECVE-2017-1000112
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-10-05 01:29:00 UTC
Updated2023-06-07 12:46:00 UTC
DescriptionLinux 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.

Risk And Classification

Problem Types: CWE-362

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel All All All All

References

ReferenceSourceLinkTags
Linux Kernel - UDP Fragmentation Offset 'UFO' Privilege Escalation (Metasploit) - Linux local Exploit EXPLOIT-DB www.exploit-db.com
Red Hat Customer Portal REDHAT access.redhat.com
Linux Kernel UDP Fragmentation Offload Race Condition Lets Local Users Gain Elevated Privileges - SecurityTracker SECTRACK www.securitytracker.com Third Party Advisory, VDB Entry
Malformed Request BID www.securityfocus.com Third Party Advisory, VDB Entry
Red Hat Customer Portal REDHAT access.redhat.com
Red Hat Customer Portal REDHAT access.redhat.com
kernel-exploits/CVE-2017-1000112 at master · xairy/kernel-exploits · GitHub MISC github.com
Red Hat Customer Portal REDHAT access.redhat.com
Red Hat Customer Portal REDHAT access.redhat.com
Red Hat Customer Portal REDHAT access.redhat.com
Debian -- Security Information -- DSA-3981-1 linux DEBIAN www.debian.org
Red Hat Customer Portal REDHAT access.redhat.com
oss-sec: Linux kernel: CVE-2017-1000112: Exploitable memory corruption due to UFO to non-UFO path switch MLIST seclists.org Mailing List, Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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