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CVE-2017-1000112

Status Candidate

Overview

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.

Related Files

Kernel Live Patch Security Notice LSN-0028-1
Posted Aug 18, 2017
Authored by Benjamin M. Romer

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. Andrey Konovalov discovered a race condition in AF_PACKET socket option handling code in the Linux kernel. A local unprivileged attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local, udp
systems | linux
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | c8908f6bf286f4cf4b1a6341a51852ff
Ubuntu Security Notice USN-3386-2
Posted Aug 10, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3386-2 - USN-3386-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 ESM. Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, udp, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | 245b433e13a5564b7156e05c3370eec7
Ubuntu Security Notice USN-3386-1
Posted Aug 10, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3386-1 - Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code. Andrey Konovalov discovered a race condition in AF_PACKET socket option handling code in the Linux kernel. A local unprivileged attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, udp
systems | linux, ubuntu
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | db8abfde2995ca9573a601d639910c06
Ubuntu Security Notice USN-3385-2
Posted Aug 10, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3385-2 - USN-3385-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, udp, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | 2947313225a541781e5aabb22f271277
Ubuntu Security Notice USN-3385-1
Posted Aug 10, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3385-1 - Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code. Andrey Konovalov discovered a race condition in AF_PACKET socket option handling code in the Linux kernel. A local unprivileged attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, udp
systems | linux, ubuntu
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | 886c3cfff8afc1ebc53f5aee4a8b5521
Ubuntu Security Notice USN-3384-2
Posted Aug 10, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3384-2 - USN-3384-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.04. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS. Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, udp, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | 3ec3aa7eb60579646c105eee729ff405
Ubuntu Security Notice USN-3384-1
Posted Aug 10, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3384-1 - Andrey Konovalov discovered a race condition in the UDP Fragmentation Offload code in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code. Andrey Konovalov discovered a race condition in AF_PACKET socket option handling code in the Linux kernel. A local unprivileged attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, udp
systems | linux, ubuntu
advisories | CVE-2017-1000111, CVE-2017-1000112
MD5 | e47cc57a0e9397738e976643425f72c4
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