CVE-2020-10378: 
Python vulnerability analysis and mitigation

CVE-2020-10378 is a security vulnerability discovered in Pillow (Python Imaging Library) versions before 7.1.0. The vulnerability was disclosed in March 2020 and affects the PCX image file format decoder. This vulnerability involves an out-of-bounds read condition that occurs when reading PCX files where state->shuffle is instructed to read beyond state->buffer (CVE Details).

The vulnerability exists in the libImaging/PcxDecode.c component of Pillow and manifests as a bounds overflow condition during PCX file decoding. The CVSS v3.1 score for this vulnerability is 5.5 (Medium), with the following metrics: Attack Vector: Local, Attack Complexity: Low, Privileges Required: None, User Interaction: Required, Scope: Unchanged, Confidentiality: High, Integrity: None, Availability: None (Ubuntu).

If exploited, this vulnerability could allow an attacker to cause an out-of-bounds read when processing specially crafted PCX image files. This could potentially lead to information disclosure or application crashes, resulting in a denial of service condition (Ubuntu USN).

The vulnerability requires user interaction to open a specially crafted PCX file. An attacker would need to trick a user or automated system into processing a malicious PCX image to trigger the vulnerability (Ubuntu USN).

The vulnerability was fixed in Pillow version 7.1.0. Various Linux distributions have also released security updates to address this issue: Ubuntu has released fixes for versions 20.04 LTS (7.0.0-4ubuntu0.1), 18.04 LTS (5.1.0-1ubuntu0.3), and 16.04 LTS (3.1.2-0ubuntu1.4). Fedora has released updates for version 31 (6.2.2-3.fc31) and 32 (7.0.0-4.fc32) (Ubuntu USN, Fedora Update).