Infinite loop in Pillow - CVE-2021-28676

Vulnerability identifier: #VU52190

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-28676

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in FliDecode.c. A remote attacker can consume all available system resources and cause denial of service conditions.

Pillow
Fedora
openSUSE Leap
Ubuntu
python3-pil (Ubuntu package)
python-pil (Ubuntu package)
python3-pillow
mingw-python-pillow
python-pillow
python-Pillow-debuginfo
python3-Pillow-tk
python-Pillow-debugsource
python3-Pillow
python3-Pillow-tk-debuginfo
python3-Pillow-debuginfo

Install updates from vendor's website.

Pillow - update to 8.2.0
python3-pil (Ubuntu package) - addressed in versions 5.1.0-1ubuntu0.6, 7.0.0-4ubuntu0.4, 7.2.0-1ubuntu0.3, 8.1.2-1ubuntu0.1
python-pil (Ubuntu package) - update to 5.1.0-1ubuntu0.6
python3-pillow - update to 6.2.2-3.el7
mingw-python-pillow - addressed in versions 7.2.0-6.fc33, 8.1.2-2.fc34
python-pillow - addressed in versions 7.2.0-6.fc33, 8.1.2-3.fc34
python-Pillow-debuginfo - update to 7.2.0-150300.3.12.1
python3-Pillow-tk - update to 7.2.0-150300.3.12.1
python-Pillow-debugsource - update to 7.2.0-150300.3.12.1
python3-Pillow - update to 7.2.0-150300.3.12.1
python3-Pillow-tk-debuginfo - update to 7.2.0-150300.3.12.1
python3-Pillow-debuginfo - update to 7.2.0-150300.3.12.1

• https://github.com/python-pillow/Pillow/releases/tag/8.2.0
• https://github.com/python-pillow/Pillow/pull/5377/commits/8ec027867f19633d9adfc5c8b7504d9b609fc5f1

• Multiple vulnerabilities in Pillow
• Ubuntu update for pillow
• SUSE update for python-Pillow
• Fedora 34 update for mingw-python-pillow, python-pillow
• Fedora 33 update for mingw-python-pillow, python-pillow
• Fedora EPEL 7 update for python3-pillow