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Vulnerability Details : CVE-2020-27170

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable 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-f232326f6966. This affects pointer types that do not define a ptr_limit.
Publish Date : 2021-03-20 Last Update Date : 2021-04-08
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- CVSS Scores & Vulnerability Types

CVSS Score
1.9
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Obtain Information
CWE ID 203

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:2314: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20212314 unix
RHSA-2021:2316: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20212316 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2020-27170

# Product Type Vendor Product Version Update Edition Language
1 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
4 OS Linux Linux Kernel * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fedoraproject Fedora 3
Linux Linux Kernel 1

- References For CVE-2020-27170

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f232326f6966cf2a1d1db7bc917a4ce5f9f55f76
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
https://www.openwall.com/lists/oss-security/2021/03/19/2
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/2021/03/24/4
MLIST [oss-security] 20210324 Re: [CVE-2020-27170] Protection against speculatively out-of-bounds loads in the Linux kernel can be bypassed by unprivileged local users to leak content of kernel memory
https://lists.fedoraproject.org/archives/list/[email protected]/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/
FEDORA FEDORA-2021-9503fffad9
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
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html

- Metasploit Modules Related To CVE-2020-27170

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


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