CVE-2017-1000112 (GCVE-0-2017-1000112)

Vulnerability from cvelistv5 – Published: 2017-10-04 01:00 – Updated: 2024-08-05 21:53
VLAI?
Summary
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 ?
No CVSS data available.
CWE
  • n/a
Assigner
References
http://seclists.org/oss-sec/2017/q3/277 mailing-listx_refsource_MLIST
https://access.redhat.com/errata/RHSA-2017:3200 vendor-advisoryx_refsource_REDHAT
http://www.securityfocus.com/bid/100262 vdb-entryx_refsource_BID
https://access.redhat.com/errata/RHSA-2017:2918 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2017:2931 vendor-advisoryx_refsource_REDHAT
http://www.debian.org/security/2017/dsa-3981 vendor-advisoryx_refsource_DEBIAN
https://github.com/xairy/kernel-exploits/tree/mas… x_refsource_MISC
http://www.securitytracker.com/id/1039162 vdb-entryx_refsource_SECTRACK
https://www.exploit-db.com/exploits/45147/ exploitx_refsource_EXPLOIT-DB
https://access.redhat.com/errata/RHSA-2017:2930 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:1932 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:1931 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:4159 vendor-advisoryx_refsource_REDHAT
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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