CVE-2022-20792

A vulnerability in the regex module used by the signature database load module of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an authenticated, local attacker to crash ClamAV at database load time, and possibly gain code execution. The vulnerability is due to improper bounds checking that may result in a multi-byte heap buffer overwflow write. An attacker could exploit this vulnerability by placing a crafted CDB ClamAV signature database file in the ClamAV database directory. An exploit could allow the attacker to run code as the clamav user.

Clam AntiVirus (clamav) is an open source antivirus engine for detecting trojans, viruses, malware and other malicious threats. The main purpose of this software is the integration with mail servers (attachment scanning). The package provides a flexible and scalable multi-threaded daemon, a command line scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use with your own software. he virus database is based on the virus database from OpenAntiVirus, but contains additional signatures and is KEPT UP TO DATE.

Security Fix(es):

On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed: A vulnerability in CHM file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog. This advisory will be updated as additional information becomes available.(CVE-2022-20770)

On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed: A vulnerability in the TIFF file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog. This advisory will be updated as additional information becomes available.(CVE-2022-20771)

On April 20, 2022, the following vulnerability in the ClamAV scanning library versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed: A vulnerability in HTML file parser of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog. This advisory will be updated as additional information becomes available.(CVE-2022-20785)

Fixed a possible multi-byte heap buffer overflow write vulnerability in the signature database load module. The fix was to update the vendored regex library to the latest version. Issue affects versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions. Thank you to Michał Dardas for reporting this issue.(CVE-2022-20792)

A vulnerability in the regex module used by the signature database load module of Clam AntiVirus (ClamAV) versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions could allow an authenticated, local attacker to crash ClamAV at database load time, and possibly gain code execution. The vulnerability is due to improper bounds checking that may result in a multi-byte heap buffer overwflow write. An attacker could exploit this vulnerability by placing a crafted CDB ClamAV signature database file in the ClamAV database directory. An exploit could allow the attacker to run code as the clamav user.

Infinite loop vulnerability in the CHM file parser. Issue affects versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions. (CVE-2022-20770)

Infinite loop vulnerability in the TIFF file parser. Issue affects versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions. The issue only occurs if the "--alert-broken-media" ClamScan option is enabled. For ClamD, the affected option is "AlertBrokenMedia yes", and for libclamav it is the "CL_SCAN_HEURISTIC_BROKEN_MEDIA" scan option. (CVE-2022-20771)

Memory leak in the HTML file parser / Javascript normalizer. Issue affects versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions. (CVE-2022-20785)

Multi-byte heap buffer overflow write vulnerability in the signature database load module. The fix was to update the vendored regex library to the latest version. Issue affects versions 0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions. (CVE-2022-20792)

NULL-pointer dereference crash in the scan verdict cache check. Issue affects versions 0.103.4, 0.103.5, 0.104.1, and 0.104.2. (CVE-2022-20796)

These are all security issues fixed in the clamav-0.103.6-1.1 package on the GA media of openSUSE Tumbleweed.

This update for clamav fixes the following issues:

• CVE-2022-20770: Fixed a possible infinite loop vulnerability in the CHM file parser (bsc#1199242).
• CVE-2022-20796: Fixed a possible NULL-pointer dereference crash in the scan verdict cache check (bsc#1199246).
• CVE-2022-20771: Fixed a possible infinite loop vulnerability in the TIFF file parser (bsc#1199244).
• CVE-2022-20785: Fixed a possible memory leak in the HTML file parser / Javascript normalizer (bsc#1199245).
• CVE-2022-20792: Fixed a possible multi-byte heap buffer overflow write vulnerability in the signature database load module (bsc#1199274).

This update for clamav fixes the following issues:

• CVE-2022-20770: Fixed a possible infinite loop vulnerability in the CHM file parser (bsc#1199242).
• CVE-2022-20796: Fixed a possible NULL-pointer dereference crash in the scan verdict cache check (bsc#1199246).
• CVE-2022-20771: Fixed a possible infinite loop vulnerability in the TIFF file parser (bsc#1199244).
• CVE-2022-20785: Fixed a possible memory leak in the HTML file parser / Javascript normalizer (bsc#1199245).
• CVE-2022-20792: Fixed a possible multi-byte heap buffer overflow write vulnerability in the signature database load module (bsc#1199274).

Michał Dardas discovered that ClamAV incorrectly handled parsing CHM files. A remote attacker could possibly use this issue to cause ClamAV to stop responding, resulting in a denial of service. (CVE-2022-20770)

Michał Dardas discovered that ClamAV incorrectly handled parsing TIFF files. A remote attacker could possibly use this issue to cause ClamAV to stop responding, resulting in a denial of service. (CVE-2022-20771)

Michał Dardas discovered that ClamAV incorrectly handled parsing HTML files. A remote attacker could possibly use this issue to cause ClamAV to consume resources, resulting in a denial of service. (CVE-2022-20785)

Michał Dardas discovered that ClamAV incorrectly handled loading the signature database. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2022-20792)

Alexander Patrakov and Antoine Gatineau discovered that ClamAV incorrectly handled the scan verdict cache check. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service, or possibly execute arbitrary code.(CVE-2022-20796)

USN-5423-1 fixed several vulnerabilities in ClamAV. This update provides the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

Michał Dardas discovered that ClamAV incorrectly handled parsing CHM files. A remote attacker could possibly use this issue to cause ClamAV to stop responding, resulting in a denial of service. (CVE-2022-20770)

Michał Dardas discovered that ClamAV incorrectly handled parsing TIFF files. A remote attacker could possibly use this issue to cause ClamAV to stop responding, resulting in a denial of service. (CVE-2022-20771)

Michał Dardas discovered that ClamAV incorrectly handled parsing HTML files. A remote attacker could possibly use this issue to cause ClamAV to consume resources, resulting in a denial of service. (CVE-2022-20785)

Michał Dardas discovered that ClamAV incorrectly handled loading the signature database. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2022-20792)

Alexander Patrakov and Antoine Gatineau discovered that ClamAV incorrectly handled the scan verdict cache check. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service, or possibly execute arbitrary code.(CVE-2022-20796)