<p>Upgrade <code>Debian:11</code> <code>glibc</code> to version 2.31-2 or higher.</p>

Integer Underflow Affecting glibc package, versions <2.31-2

Threat Intelligence

7.4% (95^th percentile)

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Snyk ID SNYK-DEBIAN11-GLIBC-564232
published 2 Apr 2020
disclosed 1 Apr 2020

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Introduced: 1 Apr 2020

CVE-2020-6096 Open this link in a new tab CWE-191 Open this link in a new tab

How to fix?

Upgrade Debian:11 glibc to version 2.31-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream glibc package and not the glibc package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.

References

CVSS Scores

version 3.1

Attack Vector (AV)

Network
Attack Complexity (AC)

High
Privileges Required (PR)

None
User Interaction (UI)

None

Scope (S)

Unchanged

Confidentiality (C)

High
Integrity (I)

High
Availability (A)

High