CVE-2018-14633

Published: 24 September 2018

A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.

From the Ubuntu security team

It was discovered that a stack-based buffer overflow existed in the iSCSI target implementation of the Linux kernel. A remote attacker could use this to cause a denial of service (system crash).

Priority

Medium

CVSS 3 base score: 7.0

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-36.39)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-137.163)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (3.13.0-160.210)
Patches:
Introduced by e48354ce078c079996f89d715dfa44814b4eba01
Fixed by 1816494330a83f2a064499d8ed2797045641f92c
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1023.23)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1069.79)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-1031.34)
linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1025.26)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1025.26~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.15.0-1030.31~14.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-1004.4~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1025.26)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(was needed ESM criteria)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1021.22)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1021.22~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-36.39~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-11.12~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-36.39~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1023.23)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1035.41)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-137.163~14.04.1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1021.24)
Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(was needed now end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1024.26)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1098.106)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1102.107)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist