Executive Summary

Informations
NameCVE-2019-10639First vendor Publication2019-07-05
VendorCveLast vendor Modification2019-07-19

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Cvss Base Score5Attack RangeNetwork
Cvss Impact Score2.9Attack ComplexityLow
Cvss Expoit Score10AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-10639

CWE : Common Weakness Enumeration

%idName
100 %CWE-200Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Os932

Sources (Detail)

SourceUrl
BUGTRAQ https://seclists.org/bugtraq/2019/Aug/18
CONFIRM https://security.netapp.com/advisory/ntap-20190806-0001/
DEBIAN https://www.debian.org/security/2019/dsa-4497
MISC https://arxiv.org/pdf/1906.10478.pdf
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=35...
https://github.com/torvalds/linux/commit/355b98553789b646ed97ad801a619ff89847...
MLIST https://lists.debian.org/debian-lts-announce/2019/07/msg00022.html
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
SUSE http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html

Alert History

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DateInformations
2019-08-15 12:07:02
  • Multiple Updates
2019-08-14 12:10:29
  • Multiple Updates
2019-08-07 12:10:25
  • Multiple Updates
2019-08-06 12:03:41
  • Multiple Updates
2019-07-24 05:19:22
  • Multiple Updates
2019-07-20 17:19:14
  • Multiple Updates
2019-07-19 17:19:17
  • Multiple Updates
2019-07-17 09:18:55
  • Multiple Updates
2019-07-08 05:19:08
  • Multiple Updates
2019-07-06 05:19:33
  • First insertion