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Vulnerability Details : CVE-2020-27171

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-10d2bb2e6b1d.
Publish Date : 2021-03-20 Last Update Date : 2022-07-30
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- CVSS Scores & Vulnerability Types

CVSS Score
3.6
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Obtain Information
CWE ID 193

- Products Affected By CVE-2020-27171

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 14.04 * * * Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 16.04 * * * Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 18.04 * * * Version Details Vulnerabilities
4 OS Canonical Ubuntu Linux 20.04 * * * Version Details Vulnerabilities
5 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
6 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
7 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
8 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
9 OS Linux Linux Kernel * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 4
Debian Debian Linux 1
Fedoraproject Fedora 3
Linux Linux Kernel 1

- References For CVE-2020-27171

https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
MLIST [debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security update
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/patch/?id=10d2bb2e6b1d8c4576c56a748f697dbeb8388899
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
https://www.openwall.com/lists/oss-security/2021/03/19/3
https://lists.fedoraproject.org/archives/list/[email protected]/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/
FEDORA FEDORA-2021-f0181b8085
https://lists.fedoraproject.org/archives/list/[email protected]/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/
FEDORA FEDORA-2021-e49da8a226
http://www.openwall.com/lists/oss-security/2021/03/24/5
MLIST [oss-security] 20210324 Re: [CVE-2020-27171] Numeric error when restricting speculative pointer arithmetic allows unprivileged local users to leak content of kernel memory
https://lists.fedoraproject.org/archives/list/[email protected]/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/
FEDORA FEDORA-2021-9503fffad9

- Metasploit Modules Related To CVE-2020-27171

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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