CVE-2018-14633 Information
Description
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.
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Reference
http://www.securityfocus.com/bid/105388 https://access.redhat.com/errata/RHSA-2018:3651 https://access.redhat.com/errata/RHSA-2018:3666 https://access.redhat.com/errata/RHSA-2019:1946 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14633 https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92c https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fe https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html https://seclists.org/oss-sec/2018/q3/270 https://usn.ubuntu.com/3775-1/ https://usn.ubuntu.com/3775-2/ https://usn.ubuntu.com/3776-1/ https://usn.ubuntu.com/3776-2/ https://usn.ubuntu.com/3777-1/ https://usn.ubuntu.com/3777-2/ https://usn.ubuntu.com/3777-3/ https://usn.ubuntu.com/3779-1/ https://www.debian.org/security/2018/dsa-4308
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction Required
NONE
Scope
NONE
Confidentiality Impact
UNCHANGED
Integrity Impact
LOW
Availability Impact
LOW
Base Score
HIGH
Base Severity
7.0
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