CVE-2018-20989 - Integer Underflow (Wrap or Wraparound)

Severity

50%

Complexity

99%

Confidentiality

48%

An issue was discovered in the untrusted crate before 0.6.2 for Rust. Error handling can trigger an integer underflow and panic.

An issue was discovered in the untrusted crate before 0.6.2 for Rust. Error handling can trigger an integer underflow and panic.

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 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P).

Demo Examples

Integer Underflow (Wrap or Wraparound)

CWE-191

The following example subtracts from a 32 bit signed integer.


               
}
return 0;

The example has an integer underflow. The value of i is already at the lowest negative value possible, so after subtracting 1, the new value of i is 2147483647.

Overview

First reported 5 years ago

2019-08-26 18:15:00

Last updated 5 years ago

2019-08-30 13:18:00

Affected Software

Untrusted Project Untrusted

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