GNU C Library 2.30.9000 Comparison memcpy num integer underflow

Summaryinfo

A vulnerability was found in GNU C Library 2.30.9000. It has been classified as critical. The affected element is the function memcpy of the component Comparison. The manipulation of the argument num as part of Negative Value leads to integer underflow. This vulnerability is referenced as CVE-2020-6096. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in GNU C Library 2.30.9000 (Software Library). It has been rated as critical. This issue affects the function memcpy of the component Comparison. The manipulation of the argument num as part of a Negative Value leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

The weakness was published 04/01/2020. The identification of this vulnerability is CVE-2020-6096 since 01/07/2020. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Software Library

Vendor

• GNU

Name

• C Library

Version

• 2.30.9000

License

• open-source

Website

• Vendor: https://www.gnu.org/

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