Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2020-1711

Heap-based Buffer Overflow

Published: Feb 11, 2020 | Modified: Nov 21, 2024
CVSS 3.x
6
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
CVSS 2.x
6 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P
RedHat/V2
RedHat/V3
6 IMPORTANT
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-1711
CWEhttps://cwe.mitre.org/data/definitions/122.html

An out-of-bounds heap buffer access flaw was found in the way the iSCSI Block driver in QEMU versions 2.12.0 before 4.2.1 handled a response coming from an iSCSI server while checking the status of a Logical Address Block (LBA) in an iscsi_co_block_status() routine. A remote user could use this flaw to crash the QEMU process, resulting in a denial of service or potential execution of arbitrary code with privileges of the QEMU process on the host.

Weakness

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Affected Software

Name Vendor Start Version End Version
Qemu Qemu 2.12.0 (including) 4.2.1 (excluding)
Advanced Virtualization for RHEL 8.1.1 RedHat virt:8.1-8010120200215151946.5db1954d *
Advanced Virtualization for RHEL 8.1.1 RedHat virt-devel:8.1-8010120200215151946.5db1954d *
Red Hat Enterprise Linux 7 RedHat qemu-kvm-ma-10:2.12.0-44.el7 *
Red Hat Enterprise Linux 7.5 Extended Update Support RedHat qemu-kvm-ma-10:2.10.0-21.el7_5.5 *
Red Hat Enterprise Linux 7.6 Extended Update Support RedHat qemu-kvm-ma-10:2.12.0-18.el7_6.5 *
Red Hat Enterprise Linux 7.7 Extended Update Support RedHat qemu-kvm-ma-10:2.12.0-33.el7_7.3 *
Red Hat Enterprise Linux 8 RedHat virt-devel:rhel-8010020200304114113.c27ad7f8 *
Red Hat Enterprise Linux 8 RedHat virt:rhel-8010020200304114113.c27ad7f8 *
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions RedHat virt:rhel-8000020200331183759.f8e95b4e *
Red Hat OpenStack Platform 10.0 (Newton) RedHat qemu-kvm-rhev-10:2.12.0-33.el7_7.10 *
Red Hat OpenStack Platform 13.0 (Queens) RedHat qemu-kvm-rhev-10:2.12.0-44.el7 *
Red Hat OpenStack Platform 13.0 (Queens) for RHEL 7.6 EUS RedHat qemu-kvm-rhev-10:2.12.0-18.el7_6.9 *
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 RedHat qemu-kvm-rhev-10:2.12.0-44.el7 *
Red Hat Virtualization Engine 4.2 RedHat qemu-kvm-rhev-10:2.12.0-18.el7_6.9 *
Red Hat Virtualization Engine 4.3 RedHat qemu-kvm-rhev-10:2.12.0-44.el7 *
Qemu Ubuntu bionic *
Qemu Ubuntu devel *
Qemu Ubuntu eoan *
Qemu Ubuntu esm-infra-legacy/trusty *
Qemu Ubuntu focal *
Qemu Ubuntu groovy *
Qemu Ubuntu hirsute *
Qemu Ubuntu impish *
Qemu Ubuntu jammy *
Qemu Ubuntu kinetic *
Qemu Ubuntu lunar *
Qemu Ubuntu mantic *
Qemu Ubuntu noble *
Qemu Ubuntu oracular *
Qemu Ubuntu trusty *
Qemu Ubuntu trusty/esm *
Qemu Ubuntu xenial *
Qemu-kvm Ubuntu precise/esm *

Potential Mitigations

  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
  • D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
  • Run or compile the software using features or extensions that randomly arrange the positions of a program’s executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
  • Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as “rebasing” (for Windows) and “prelinking” (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
  • For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].

References

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