CVE-2017-2344 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Severity

72%

Complexity

39%

Confidentiality

165%

A routine within an internal Junos OS sockets library is vulnerable to a buffer overflow. Malicious exploitation of this issue may lead to a denial of service (kernel panic) or be leveraged as a privilege escalation through local code execution. The routines are only accessible via programs running on the device itself, and veriexec restricts arbitrary programs from running on Junos OS. There are no known exploit vectors utilizing signed binaries shipped with Junos OS itself. Affected releases are Juniper Networks Junos OS 12.1X46 prior to 12.1X46-D67; 12.3X48 prior to 12.3X48-D51, 12.3X48-D55; 13.3 prior to 13.3R10-S2; 14.1 prior to 14.1R2-S10, 14.1R8-S4, 14.1R9; 14.1X50 prior to 14.1X50-D185; 14.1X53 prior to 14.1X53-D122, 14.1X53-D45, 14.1X53-D50; 14.2 prior to 14.2R4-S9, 14.2R7-S7, 14.2R8; 15.1 prior to 15.1F2-S18, 15.1F6-S7, 15.1R4-S8, 15.1R5-S5, 15.1R6-S1, 15.1R7; 15.1X49 prior to 15.1X49-D100; 15.1X53 prior to 15.1X53-D231, 15.1X53-D47, 15.1X53-D48, 15.1X53-D57, 15.1X53-D64, 15.1X53-D70; 16.1 prior to 16.1R3-S4, 16.1R4-S3, 16.1R4-S4, 16.1R5; 16.2 prior to 16.2R2; 17.1 prior to 17.1R1-S3, 17.1R2; 17.2 prior to 17.2R1-S1, 17.2R2; 17.2X75 prior to 17.2X75-D30. No other Juniper Networks products or platforms are affected by this issue.

A routine within an internal Junos OS sockets library is vulnerable to a buffer overflow. Malicious exploitation of this issue may lead to a denial of service (kernel panic) or be leveraged as a privilege escalation through local code execution. The routines are only accessible via programs running on the device itself, and veriexec restricts arbitrary programs from running on Junos OS. There are no known exploit vectors utilizing signed binaries shipped with Junos OS itself. Affected releases are Juniper Networks Junos OS 12.1X46 prior to 12.1X46-D67; 12.3X48 prior to 12.3X48-D51, 12.3X48-D55; 13.3 prior to 13.3R10-S2; 14.1 prior to 14.1R2-S10, 14.1R8-S4, 14.1R9; 14.1X50 prior to 14.1X50-D185; 14.1X53 prior to 14.1X53-D122, 14.1X53-D45, 14.1X53-D50; 14.2 prior to 14.2R4-S9, 14.2R7-S7, 14.2R8; 15.1 prior to 15.1F2-S18, 15.1F6-S7, 15.1R4-S8, 15.1R5-S5, 15.1R6-S1, 15.1R7; 15.1X49 prior to 15.1X49-D100; 15.1X53 prior to 15.1X53-D231, 15.1X53-D47, 15.1X53-D48, 15.1X53-D57, 15.1X53-D64, 15.1X53-D70; 16.1 prior to 16.1R3-S4, 16.1R4-S3, 16.1R4-S4, 16.1R5; 16.2 prior to 16.2R2; 17.1 prior to 17.1R1-S3, 17.1R2; 17.2 prior to 17.2R1-S1, 17.2R2; 17.2X75 prior to 17.2X75-D30. No other Juniper Networks products or platforms are affected by this issue.

CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C).

Demo Examples

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-119

This example takes an IP address from a user, verifies that it is well formed and then looks up the hostname and copies it into a buffer.


               
}
strcpy(hostname, hp->h_name);/*routine that ensures user_supplied_addr is in the right format for conversion */

This function allocates a buffer of 64 bytes to store the hostname, however there is no guarantee that the hostname will not be larger than 64 bytes. If an attacker specifies an address which resolves to a very large hostname, then we may overwrite sensitive data or even relinquish control flow to the attacker.

Note that this example also contains an unchecked return value (CWE-252) that can lead to a NULL pointer dereference (CWE-476).

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-119

This example applies an encoding procedure to an input string and stores it into a buffer.


               
}
return dst_buf;
die("user string too long, die evil hacker!");
else dst_buf[dst_index++] = user_supplied_string[i];
dst_buf[dst_index++] = ';';
/* encode to < */

The programmer attempts to encode the ampersand character in the user-controlled string, however the length of the string is validated before the encoding procedure is applied. Furthermore, the programmer assumes encoding expansion will only expand a given character by a factor of 4, while the encoding of the ampersand expands by 5. As a result, when the encoding procedure expands the string it is possible to overflow the destination buffer if the attacker provides a string of many ampersands.

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-119

The following example asks a user for an offset into an array to select an item.


               
}
printf("You selected %s\n", items[index-1]);

The programmer allows the user to specify which element in the list to select, however an attacker can provide an out-of-bounds offset, resulting in a buffer over-read (CWE-126).

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-119

In the following code, the method retrieves a value from an array at a specific array index location that is given as an input parameter to the method


               
}
return value;// check that the array index is less than the maximum// length of the array
value = array[index];// get the value at the specified index of the array
// if array index is invalid then output error message// and return value indicating error
value = -1;

However, this method only verifies that the given array index is less than the maximum length of the array but does not check for the minimum value (CWE-839). This will allow a negative value to be accepted as the input array index, which will result in a out of bounds read (CWE-125) and may allow access to sensitive memory. The input array index should be checked to verify that is within the maximum and minimum range required for the array (CWE-129). In this example the if statement should be modified to include a minimum range check, as shown below.


               
...// check that the array index is within the correct// range of values for the array

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-119

Windows provides the _mbs family of functions to perform various operations on multibyte strings. When these functions are passed a malformed multibyte string, such as a string containing a valid leading byte followed by a single null byte, they can read or write past the end of the string buffer causing a buffer overflow. The following functions all pose a risk of buffer overflow: _mbsinc _mbsdec _mbsncat _mbsncpy _mbsnextc _mbsnset _mbsrev _mbsset _mbsstr _mbstok _mbccpy _mbslen

Overview

Type

Juniper

First reported 7 years ago

2017-07-17 13:18:00

Last updated 5 years ago

2019-10-09 23:26:00

Affected Software

Juniper JUNOS 12.1X46

12.1x46

Juniper Junos 12.1x46 D10

12.1x46

Juniper Junos 12.1x46 D15

12.1x46

Juniper JUNOS 12.1X46-D20

12.1x46

Juniper Junos 12.1x46 D25

12.1x46

Juniper JunOS 12.1x46 D30

12.1x46

Juniper JunOS 12.1x46 D35

12.1x46

Juniper JunOS 12.1x46 D40

12.1x46

Juniper Junos 12.1X46 D45

12.1x46

Juniper Junos 12.1X46 D50

12.1x46

Juniper JunOS 12.1X46 D55

12.1x46

Juniper JunOS 12.1X46 D60

12.1x46

Juniper Junos 12.1X46 D65

12.1x46

Juniper JunOS 12.3x48 D10

12.3x48

Juniper JunOS 12.3x48 D15

12.3x48

Juniper Junos OS 12.3X48 D20

12.3x48

Juniper Junos 12.3X48 D25

12.3x48

Juniper Junos OS 12.3X48 D30

12.3x48

Juniper Junos OS 12.3X48 D35

12.3x48

Juniper Junos OS 12.3X48 D40

12.3x48

Juniper Junos OS 12.3X48 D45

12.3x48

Juniper Junos OS 12.3X48 D50

12.3x48

Juniper Junos OS 12.3X48 D55

12.3x48

Juniper JUNOS 13.3

13.3

Juniper Junos 13.3 R1

13.3

Juniper Junos 13.3 R2

13.3

Juniper JUNOS 13.3R2-S2

13.3

Juniper Junos 13.3 R3

13.3

Juniper Junos 13.3 R4

13.3

Juniper Junos 13.3 R5

13.3

Juniper JUNOS 13.3 R6

13.3

Juniper Junos 13.3 R7

13.3

Juniper Junos 13.3 R8

13.3

Juniper Junos 13.3 R9

13.3

Juniper JUNOS 14.1

14.1

Juniper JUNOS 14.1R1

14.1

Juniper Junos 14.1 R2

14.1

Juniper Junos 14.1 R3

14.1

Juniper JunOS 14.1 R4

14.1

Juniper Junos 14.1 R5

14.1

Juniper Junos 14.1 R6

14.1

Juniper Junos 14.1 R7

14.1

Juniper JunOS 14.1 R9

14.1

Juniper Junos 14.1X50

14.1x50

Juniper JunOS 14.1x53

14.1x53

Juniper JunOS 14.1x53 D10

14.1x53

Juniper Junos 14.1X53 D121

14.1x53

Juniper JunOS 14.1x53 D15

14.1x53

Juniper JunOS 14.1x53 D16

14.1x53

Juniper JunOS 14.1x53 D25

14.1x53

Juniper JunOS 14.1x53 D26

14.1x53

Juniper Junos 14.1X53 D27

14.1x53

Juniper Junos 14.1X53 D30

14.1x53

Juniper Junos 14.1X53 D35

14.1x53

Juniper JunOS 14.1x53 D40

14.1x53

Juniper Junos 14.1X53 D42

14.1x53

Juniper Junos 14.1X53 D43

14.1x53

Juniper JunOS 14.1X53 D45

14.1x53

Juniper Junos 14.1X53 D50

14.1x53

Juniper Junos 14.2 R1

14.2

Juniper Junos 14.2 R2

14.2

Juniper Junos 14.2 R3

14.2

Juniper Junos 14.2 R4

14.2

Juniper Junos 14.2 R5

14.2

Juniper Junos 14.2 R6

14.2

Juniper JunOS 14.2 R7

14.2

Juniper Junos 14.2 R7-S7

14.2

Juniper Junos 14.2 R8

14.2

Juniper JunOS 15.1 F1

15.1

Juniper JunOS 15.1 F2

15.1

Juniper JunOS 15.1 F2-s1

15.1

Juniper Junos 15.1 F2-S2

15.1

Juniper Junos 15.1 F2-S3

15.1

Juniper Junos 15.1 F2-S4

15.1

Juniper Junos 15.1 F6-S7

15.1

Juniper JunOS 15.1 R4

15.1

Juniper Junos 15.1 R4-S8

15.1

Juniper Junos 15.1 R5-S5

15.1

Juniper Junos 15.1 R6-S1

15.1

Juniper Junos OS 15.1 R7

15.1

Juniper JunOS 15.1x49 D10

15.1x49

Juniper JunOS 15.1x49 D20

15.1x49

Juniper JunOS 15.1X49 D30

15.1x49

Juniper Junos 15.1X49 D35

15.1x49

Juniper JunOS 15.1X49 D40

15.1x49

Juniper JunOS 15.1X49 D45

15.1x49

Juniper JunOS 15.1X49 D50

15.1x49

Juniper JunOS 15.1X49 D55

15.1x49

Juniper JunOS 15.1X49 D60

15.1x49

Juniper JunOS 15.1X49 D65

15.1x49

Juniper JunOS 15.1X49 D70

15.1x49

Juniper JunOS 15.1X49 D75

15.1x49

Juniper JunOS 15.1X49 D80

15.1x49

Juniper Junos OS 15.1X49 D90

15.1x49

Juniper Junos OS 15.1X53 D10

15.1x53

Juniper Junos 15.1X53 D20

15.1x53

Juniper Junos 15.1X53 D21

15.1x53

Juniper JunOS 15.1X53 D210

15.1x53

Juniper Junos OS 15.1X53 D230

15.1x53

Juniper JunOS 15.1X53 D25

15.1x53

Juniper Junos 15.1X53 D30

15.1x53

Juniper Junos 15.1X53 D32

15.1x53

Juniper Junos 15.1X53 D33

15.1x53

Juniper Junos 15.1X53 D34

15.1x53

Juniper Junos 15.1X53 D47

15.1x53

Juniper Junos 15.1X53 D48

15.1x53

Juniper Junos OS 15.1X53 D57

15.1x53

Juniper JunOS 15.1X53 D60

15.1x53

Juniper JunOS 15.1X53 D61

15.1x53

Juniper JunOS 15.1X53 D62

15.1x53

Juniper JunOS 15.1X53 D63

15.1x53

Juniper Junos OS 15.1X53 D64

15.1x53

Juniper JunOS 15.1X53 D70

15.1x53

Juniper JUNOS 16.1

16.1

Juniper JunOS 16.1 R1

16.1

Juniper JunOS 16.1 R2

16.1

Juniper JunOS 16.1 R3

16.1

Juniper Junos 16.1 R4-S3

16.1

Juniper Junos 16.1 R4-S4

16.1

Juniper Junos 16.1 R5

16.1

Juniper JUNOS 16.2

16.2

Juniper JunOS 16.2 R1

16.2

Juniper JUNOS 17.1

17.1

Juniper JunOS 17.1 R1

17.1

Juniper Junos 17.1 R2

17.1

Juniper JUNOS 17.2

17.2

Juniper Junos 17.2 R1

17.2

Juniper Junos 17.2 R2

17.2

Juniper JUNOS 17.2X75

17.2x75

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