CVE-2017-1000112
Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 20.8%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 20.80% probability · 97th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel
- Source
- cve@mitre.org
References
- http://seclists.org/oss-sec/2017/q3/277Mailing List, Patch, Third Party Advisory
- http://www.debian.org/security/2017/dsa-3981Third Party Advisory
- http://www.securityfocus.com/bid/100262Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039162Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2918Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2930Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3200Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1932Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4159Third Party Advisory
- https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112Third Party Advisory
- https://www.exploit-db.com/exploits/45147/Third Party Advisory, VDB Entry
- http://seclists.org/oss-sec/2017/q3/277Mailing List, Patch, Third Party Advisory
- http://www.debian.org/security/2017/dsa-3981Third Party Advisory
- http://www.securityfocus.com/bid/100262Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039162Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2918Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2930Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3200Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1932Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4159Third Party Advisory
- https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112Third Party Advisory
- https://www.exploit-db.com/exploits/45147/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.