CVE-2022-20796

On May 4, 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 Clam AntiVirus (ClamAV) versions 0.103.4, 0.103.5, 0.104.1, and 0.104.2 could allow an authenticated, local attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog.

On May 4, 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 Clam AntiVirus (ClamAV) versions 0.103.4, 0.103.5, 0.104.1, and 0.104.2 could allow an authenticated, local attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog.

On May 4, 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 Clam AntiVirus (ClamAV) versions 0.103.4, 0.103.5, 0.104.1, and 0.104.2 could allow an authenticated, local attacker to cause a denial of service condition on an affected device. For a description of this vulnerability, see the ClamAV blog.

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)