CVE-2018-5390 - Improper Input Validation

Severity

78%

Complexity

99%

Confidentiality

115%

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service.

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service.

CVSS 3.0 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 7.8. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:C).

Demo Examples

Improper Input Validation

CWE-20

This example demonstrates a shopping interaction in which the user is free to specify the quantity of items to be purchased and a total is calculated.


               
...

The user has no control over the price variable, however the code does not prevent a negative value from being specified for quantity. If an attacker were to provide a negative value, then the user would have their account credited instead of debited.

Improper Input Validation

CWE-20

This example asks the user for a height and width of an m X n game board with a maximum dimension of 100 squares.


               
.../* board dimensions */
die("No integer passed: Die evil hacker!\n");
die("No integer passed: Die evil hacker!\n");
die("Value too large: Die evil hacker!\n");

While this code checks to make sure the user cannot specify large, positive integers and consume too much memory, it does not check for negative values supplied by the user. As a result, an attacker can perform a resource consumption (CWE-400) attack against this program by specifying two, large negative values that will not overflow, resulting in a very large memory allocation (CWE-789) and possibly a system crash. Alternatively, an attacker can provide very large negative values which will cause an integer overflow (CWE-190) and unexpected behavior will follow depending on how the values are treated in the remainder of the program.

Improper Input Validation

CWE-20

The following example shows a PHP application in which the programmer attempts to display a user's birthday and homepage.


               
echo "Birthday: $birthday<br>Homepage: <a href=$homepage>click here</a>"

The programmer intended for $birthday to be in a date format and $homepage to be a valid URL. However, since the values are derived from an HTTP request, if an attacker can trick a victim into clicking a crafted URL with <script> tags providing the values for birthday and / or homepage, then the script will run on the client's browser when the web server echoes the content. Notice that even if the programmer were to defend the $birthday variable by restricting input to integers and dashes, it would still be possible for an attacker to provide a string of the form:


               
2009-01-09--

If this data were used in a SQL statement, it would treat the remainder of the statement as a comment. The comment could disable other security-related logic in the statement. In this case, encoding combined with input validation would be a more useful protection mechanism.

Furthermore, an XSS (CWE-79) attack or SQL injection (CWE-89) are just a few of the potential consequences when input validation is not used. Depending on the context of the code, CRLF Injection (CWE-93), Argument Injection (CWE-88), or Command Injection (CWE-77) may also be possible.

Improper Input Validation

CWE-20

This function attempts to extract a pair of numbers from a user-supplied string.


               
}
die("Did not specify integer value. Die evil hacker!\n");
/* proceed assuming n and m are initialized correctly */

This code attempts to extract two integer values out of a formatted, user-supplied input. However, if an attacker were to provide an input of the form:


               
123:

then only the m variable will be initialized. Subsequent use of n may result in the use of an uninitialized variable (CWE-457).

Improper Input Validation

CWE-20

The following example takes a user-supplied value to allocate an array of objects and then operates on the array.


               
}
list[0] = new Widget();
die("Negative value supplied for list size, die evil hacker!");

This example attempts to build a list from a user-specified value, and even checks to ensure a non-negative value is supplied. If, however, a 0 value is provided, the code will build an array of size 0 and then try to store a new Widget in the first location, causing an exception to be thrown.

Improper Input Validation

CWE-20

This application has registered to handle a URL when sent an intent:


               
}......
}
}
int length = URL.length();
...

The application assumes the URL will always be included in the intent. When the URL is not present, the call to getStringExtra() will return null, thus causing a null pointer exception when length() is called.

Overview

First reported 6 years ago

2018-08-06 20:29:00

Last updated 5 years ago

2019-06-28 21:15:00

Affected Software

RedHat Enterprise Linux Desktop 7.0

7.0

RedHat Enterprise Linux Server 7.0

7.0

Red Hat Enterprise Linux Server AUS 6.4

6.4

Red Hat Enterprise Linux Server Advanced mission critical Update Support (AUS) 6.5

6.5

Red Hat Enterprise Linux Server AUS 7.2

7.2

Red Hat Enterprise Linux Advanced mission critical Update Support (AUS) 7.3

7.3

Red Hat Enterprise Linux Server Advanced mission critical Update Support (AUS) 7.4

7.4

Red Hat Enterprise Linux Server EUS 7.2

7.2

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.3

7.3

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.4

7.4

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.5

7.5

Red Hat Enterprise Linux Server Telecommunications Update Service (TUS) 6.6

6.6

Red Hat Enterprise Linux Server TUS 7.4

7.4

RedHat Enterprise Linux Workstation 7.0

7.0

Linux Kernel

Linux Kernel 4.18 Release Candidate 1

4.18

Linux Kernel 4.18 Release Candidate 2

4.18

Linux Kernel 4.18 Release Candidate 3

4.18

Linux Kernel 4.18 Release Candidate 4

4.18

Linux Kernel 4.18 Release Candidate 5

4.18

Linux Kernel 4.18 Release Candidate 6

4.18

Canonical Ubuntu Linux 12.04 ESM (Extended Security Maintenance)

12.04

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

Canonical Ubuntu Linux 16.04 LTS (Long-Term Support)

16.04

Canonical Ubuntu Linux 18.04 LTS Edition

18.04

Debian Linux 8.0 (Jessie)

8.0

Debian Linux 9.0

9.0

F5 Big-IP Access Policy Manager (APM)

F5 Big-IP Access Policy Manager (APM) 14.0.0

14.0.0

F5 Big-IP Advanced Firewall Manager (AFM)

F5 Big-IP Advanced Firewall Manager (AFM) 14.0.0

14.0.0

F5 Big-IP Analytics

F5 Big-IP Analytics 14.0.0

14.0.0

F5 Big-IP Application Acceleration Manager (AAM)

F5 Big-IP Application Acceleration Manager (AAM) 14.0.0

14.0.0

F5 Big-IP Application Security Manager (ASM)

F5 Big-IP Application Security Manager (ASM) 14.0.0

14.0.0

F5 Big-IP Domain Name System (DNS)

F5 Big-IP Domain Name System (DNS) 14.0.0

14.0.0

F5 Big-IP Edge Gateway

F5 Big-IP Edge Gateway 14.0.0

14.0.0

F5 Big-IP Fraud Protection Service (FPS)

F5 Big-IP Fraud Protection Service (FPS) 14.0.0

14.0.0

F5 Big-IP Global Traffic Manager (GTM)

F5 Big-IP Global Traffic Manager (GTM) 14.0.0

14.0.0

F5 Big-IP Link Controller

F5 Big-IP Link Controller 14.0.0

14.0.0

F5 Networks Big-IP Local Traffic Manager (LTM)

F5 Big-IP Local Traffic Manager (LTM) 14.0.0

14.0.0

F5 Big-IP Policy Enforcement Manager (PEM)

F5 Big-IP Policy Enforcement Manager (PEM) 14.0.0

14.0.0

F5 Big-IP WebAccelerator

F5 Big-IP WebAccelerator 14.0.0

14.0.0

Cisco Digital Network Architecture (DNA) Center 1.2

1.2

Cisco Expressway X8.10

x8.10

Cisco Expressway X8.10.1

x8.10.1

Cisco Expressway X8.10.2

x8.10.2

Cisco Expressway X8.10.3

x8.10.3

Cisco Expressway X8.10.4

x8.10.4

Cisco Webex Video Mesh

References

http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-004.txt

Third Party Advisory

[oss-security] 20190628 Re: linux-distros membership application - Microsoft

[oss-security] 20190706 Re: linux-distros membership application - Microsoft

[oss-security] 20190706 Re: linux-distros membership application - Microsoft

104976

Third Party Advisory, VDB Entry

1041424

Third Party Advisory, VDB Entry

1041434

Third Party Advisory, VDB Entry

RHSA-2018:2384

Third Party Advisory

RHSA-2018:2395

Third Party Advisory

RHSA-2018:2402

Third Party Advisory

RHSA-2018:2403

Third Party Advisory

RHSA-2018:2645

Third Party Advisory

RHSA-2018:2776

Third Party Advisory

RHSA-2018:2785

Third Party Advisory

RHSA-2018:2789

Third Party Advisory

RHSA-2018:2790

Third Party Advisory

RHSA-2018:2791

Third Party Advisory

RHSA-2018:2924

Third Party Advisory

RHSA-2018:2933

Third Party Advisory

RHSA-2018:2948

Third Party Advisory

https://cert-portal.siemens.com/productcert/pdf/ssa-377115.pdf

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=1a4f14bab1868b443f0dd3c55b689a478f82e72e

Patch, Vendor Advisory

https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0

Third Party Advisory

[debian-lts-announce] 20180815 [SECURITY] [DLA 1466-1] linux-4.9 security update

Third Party Advisory

https://security.netapp.com/advisory/ntap-20180815-0003/

Third Party Advisory

https://support.f5.com/csp/article/K95343321

Third Party Advisory

https://support.f5.com/csp/article/K95343321?utm_source=f5support&amp;utm_medium=RSS

20180824 Linux and FreeBSD Kernels TCP Reassembly Denial of Service Vulnerabilities Affecting Cisco Products: August 2018

Third Party Advisory

USN-3732-1

Third Party Advisory

USN-3732-2

Third Party Advisory

USN-3741-1

Third Party Advisory

USN-3741-2

Third Party Advisory

USN-3742-1

Third Party Advisory

USN-3742-2

Third Party Advisory

USN-3763-1

Third Party Advisory

https://www.a10networks.com/support/security-advisories/tcp-ip-cve-2018-5390-segmentsmack

Mitigation, Third Party Advisory

DSA-4266

Third Party Advisory

VU#962459

Third Party Advisory, US Government Resource

https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html

Patch, Third Party Advisory

https://www.synology.com/support/security/Synology_SA_18_41

Third Party Advisory

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