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Vulnerability Details : CVE-2019-10639

The Linux kernel 4.x (starting from 4.1) and 5.x before 5.0.8 allows Information Exposure (partial kernel address disclosure), leading to a KASLR bypass. Specifically, it is possible to extract the KASLR kernel image offset using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). This key contains enough bits from a kernel address (of a static variable) so when the key is extracted (via enumeration), the offset of the kernel image is exposed. This attack can be carried out remotely, by the attacker forcing the target device to send UDP or ICMP (or certain other) traffic to attacker-controlled IP addresses. Forcing a server to send UDP traffic is trivial if the server is a DNS server. ICMP traffic is trivial if the server answers ICMP Echo requests (ping). For client targets, if the target visits the attacker's web page, then WebRTC or gQUIC can be used to force UDP traffic to attacker-controlled IP addresses. NOTE: this attack against KASLR became viable in 4.1 because IP ID generation was changed to have a dependency on an address associated with a network namespace.
Publish Date : 2019-07-05 Last Update Date : 2021-06-14
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
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 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) Bypass a restriction or similarObtain Information
CWE ID 326

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2020:1016: kernel security, bug fix, and enhancement update (Moderate) oval:com.redhat.rhsa:def:20201016 unix
RHSA-2020:1070: kernel-rt security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20201070 unix
RHSA-2020:1567: kernel-rt security, bug fix, and enhancement update (Important) oval:com.redhat.rhsa:def:20201567 unix
RHSA-2020:1769: kernel security, bug fix, and enhancement update (Important) oval:com.redhat.rhsa:def:20201769 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-2019-10639

# Product Type Vendor Product Version Update Edition Language
1 OS Linux Linux Kernel * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linux Linux Kernel 1

- References For CVE-2019-10639

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8
https://support.f5.com/csp/article/K32804955?utm_source=f5support&utm_medium=RSS CONFIRM
https://www.oracle.com/security-alerts/cpuApr2021.html
https://support.f5.com/csp/article/K32804955 CONFIRM
https://lists.debian.org/debian-lts-announce/2019/07/msg00022.html
MLIST [debian-lts-announce] 20190723 [SECURITY] [DLA 1862-1] linux security update
https://usn.ubuntu.com/4115-1/
UBUNTU USN-4115-1
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
MLIST [debian-lts-announce] 20190814 [SECURITY] [DLA 1885-1] linux-4.9 security update
https://seclists.org/bugtraq/2019/Aug/18
BUGTRAQ 20190813 [SECURITY] [DSA 4497-1] linux security update
https://security.netapp.com/advisory/ntap-20190806-0001/ CONFIRM
https://www.debian.org/security/2019/dsa-4497
DEBIAN DSA-4497
https://arxiv.org/pdf/1906.10478.pdf
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=355b98553789b646ed97ad801a619ff898471b92
https://github.com/torvalds/linux/commit/355b98553789b646ed97ad801a619ff898471b92
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
SUSE openSUSE-SU-2019:1757
https://usn.ubuntu.com/4118-1/
UBUNTU USN-4118-1
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html
SUSE openSUSE-SU-2019:1716

- Metasploit Modules Related To CVE-2019-10639

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


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