| Revision Date: | 2017-10-04 | Version: | 1 | | Title: | CVE-2017-1000112 on Ubuntu 18.04 LTS (bionic) - high. | | 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. Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload (UFO) code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code.
| | Family: | unix | Class: | vulnerability | | Status: | | Reference(s): | CVE-2017-1000112
| | Platform(s): | Ubuntu 18.04 LTS
| Product(s): | | | Definition Synopsis | | Ubuntu 18.04 LTS (bionic) is installed. AND Package Information
NOT While related to the CVE in some way, the 'linux' package in bionic is not affected (note: '4.13.0-16.19').
OR NOT While related to the CVE in some way, the 'linux-aws' package in bionic is not affected (note: '4.15.0-1001.1').
OR NOT While related to the CVE in some way, the 'linux-azure' package in bionic is not affected (note: '4.15.0-1002.2').
OR NOT While related to the CVE in some way, the 'linux-gcp' package in bionic is not affected (note: '4.15.0-1001.1').
OR NOT While related to the CVE in some way, the 'linux-hwe' package in bionic is not affected.
OR The 'linux-hwe-edge' package in bionic is affected. An update containing the fix has been completed and is pending publication (note: '4.18.0-8.9~18.04.1').
OR NOT While related to the CVE in some way, the 'linux-kvm' package in bionic is not affected (note: '4.15.0-1002.2').
OR NOT While related to the CVE in some way, the 'linux-oem' package in bionic is not affected (note: '4.15.0-1002.3').
OR NOT While related to the CVE in some way, the 'linux-raspi2' package in bionic is not affected (note: '4.13.0-1005.5').
|
|