Monday, May 8, 2023

End of life (EOL) policy change, 0.103 one year extension, 0.105 past end of life

End of life (EOL) policy change 

ClamAV is making a minor change to our EOL policy. 

The original EOL policy stated that Long Term Support (LTS) versions will lose access to signature updates on the same date that we end support for additional patch versions. 

We are changing the policy to allow signature updates for at least one year after we stop supporting the release with patch versions. 

0.103 support extension 

We are also announcing a one-year extension of support for ClamAV 0.103 LTS. 

We decided to extend the life of the 0.103 LTS release because of the significant changes to the build system in 0.104 and the change in 0.105 requiring the Rust programming language toolchain to compile ClamAV. 

The one-year support extension does not apply to future LTS releases. 

ClamAV 0.103.0 was initially released on Sept. 14, 2020. With the additional year of support, and considering the change in the EOL Policy that allows one additional year of access for signature updates, this means that EOL dates for ClamAV 0.103 LTS are as follows: 
  • Expected End of Life (EOL): Sept. 14, 2024 
  • Patch versions continue until: Sept. 14, 2024 
  • Internal signature load testing until: Sept. 14, 2024 
  • Database downloads allowed until: Sept. 14, 2025 

0.105 EOL 

Finally, we would like to remind everyone that as per the EOL Policy, the release of ClamAV 1.1 heralds the end of patch versions supporting ClamAV 0.105. There will no more patch versions for ClamAV 0.105.

ClamAV 0.105 will continue to have access to signature updates for an additional four months after the 1.1 release, which was on May 1, 2023. This means that we may block 0.105 from further updates after Sept. 1, 2023. 

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Monday, May 1, 2023

ClamAV 1.1.0 released

The ClamAV 1.1.0 feature release is now stable and available for download on ClamAV.net or through Docker Hub.  

ClamAV 1.1.0 includes the following improvements and changes.


Major changes

  • Added the ability to extract images embedded in HTML CSS <style> blocks.

  • Updated to Sigtool so that the --vba option will extract VBA code from Microsoft Office documents the same way that libclamav extracts VBA. This resolves several issues where Sigtool could not extract VBA. Sigtool will also now display the normalized VBA code instead of the pre-normalized VBA code.

  • Added a new ClamScan and ClamD option: --fail-if-cvd-older-than=days. Additionally, we introduce FailIfCvdOlderThan as a clamd.conf synonym for --fail-if-cvd-older-than. When passed, it causes ClamD to exit on startup with a non-zero return code if the virus database is older than the specified number of days.

  • Added a new function cl_cvdgetage() to the libclamav API. This function will retrieve the age in seconds of the youngest file in a database directory, or the age of a single CVD (or CLD) file.

  • Added a new function cl_engine_set_clcb_vba() to the libclamav API. Use this function to set a cb_vba callback function. The cb_vba callback function will be run whenever VBA is extracted from office documents. The provided data will be a normalized copy of the extracted VBA. This callback was added to support Sigtool so that it can use the same VBA extraction logic that ClamAV uses to scan documents.

Other improvements

  • Removed the vendored TomsFastMath library in favor of using OpenSSL to perform "big number"/multiprecision math operations. Work courtesy of Sebastian Andrzej Siewior.

  • Build system: Added CMake option DO_NOT_SET_RPATH to avoid setting RPATH on Unix systems. Feature courtesy of Sebastian Andrzej Siewior.

  • Build system: Enabled version-scripts with CMake to limit symbol exports for libclamav, libfreshclam, libclamunrar_iface, and libclamunrar shared libraries on Unix systems, excluding macOS. Improvement courtesy of Orion Poplawski and Sebastian Andrzej Siewior.

  • Build system: Enabled users to pass in custom Rust compiler flags using the RUSTFLAGS CMake variable. Feature courtesy of Orion Poplawski.

  • Removed a hard-coded alert for CVE-2004-0597. The CVE is old enough that it is no longer a threat and the detection had occasional false-positives.

  • Set Git attributes to prevent Git from altering line endings for Rust vendored libraries. Third-party Rust libraries are bundled in the ClamAV release tarball. We do not commit them to our own Git repository, but community package maintainers may now store the tarball contents in Git. The Rust build system verifies the library manifest, and this change ensures that the hashes are correct. Improvement courtesy of Nicolas R.

  • Fixed compile time warnings. Improvement courtesy of Răzvan Cojocaru.

  • Added a minor optimization when matching domain name regex signatures for PDB, WDB and CDB type signatures.

  • Build system: Enabled the ability to select a specific Python version. When building, you may use the CMake option -D PYTHON_FIND_VER=<version> to choose a specific Python version. Feature courtesy of Matt Jolly.

  • Added improvements to the ClamOnAcc process log output so that it is easier to diagnose bugs.

  • Windows: Enabled the MSI installer to upgrade between feature versions more easily when ClamAV is installed to a location different from the default (i.e., not C:\Program Files\ClamAV). This means that the MSI installer can find a previous ClamAV 1.0.x installation to upgrade to ClamAV 1.1.0.

  • Sigtool: Added the ability to change the location of the temp directory using the --tempdir option and added the ability to retain the temp files created by Sigtool using the --leave-temps option.

  • Other minor improvements.

Bug fixes

Acknowledgments

Special thanks to the following people for code contributions and bug reports:

  • Arjen de Korte
  • Craig Andrews
  • Ged Haywood
  • Matt Jolly
  • Orion Poplawski
  • Nicolas R.
  • Răzvan Cojocaru
  • Red
  • Shawn Iverson
  • Sebastian Andrzej Siewior
  • The OSS-Fuzz project
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Friday, March 31, 2023

ClamAV 1.1.0 release candidate now available

We are excited to announce the ClamAV 1.1.0 release candidate.

You may find the source code and installers for this release on:

Tip: If you are downloading the source from the GitHub release page, the package labeled "clamav-1.1.0-rc.tar.gz" does not require an internet connection to build.  All dependencies are included in this package.  But if you download the ZIP or TAR.GZ generated by GitHub, located at the very bottom, then an internet connection will be required during the build to download additional Rust dependencies.

For Docker users, there is no specific Docker tag for the release candidate, but you can use the clamav:unstable or clamav:unstable_base tags.

The release candidate phase is expected to last two to three weeks before we publish the stable release or a second release candidate. Please take this time to evaluate ClamAV 1.1.0.  

Please help us validate this release by providing feedback via the ClamAV mailing list or on our Discord.

ClamAV 1.1.0 includes the following improvements and changes:

Major changes

  • Added the ability to extract images embedded in HTML CSS <style> blocks.

  • Updated to Sigtool so that the --vba option will extract VBA code from Microsoft Office documents the same way that libclamav extracts VBA. This resolves several issues where Sigtool could not extract VBA. Sigtool will also now display the normalized VBA code instead of the pre-normalized VBA code.

  • Added a new ClamScan and ClamD option: --fail-if-cvd-older-than=days. Additionally, we introduce FailIfCvdOlderThan as a clamd.conf synonym for --fail-if-cvd-older-than. When passed, it causes ClamD to exit on startup with a non-zero return code if the virus database is older than the specified number of days.

  • Added a new function cl_cvdgetage() to the libclamav API. This function will retrieve the age in seconds of the youngest file in a database directory, or the age of a single CVD (or CLD) file.

  • Added a new function cl_engine_set_clcb_vba() to the libclamav API. Use this function to set a cb_vba callback function. The cb_vba callback function will be run whenever VBA is extracted from office documents. The provided data will be a normalized copy of the extracted VBA. This callback was added to support Sigtool so that it can use the same VBA extraction logic that ClamAV uses to scan documents.

Other improvements

  • Removed the vendored TomsFastMath library in favor of using OpenSSL to perform "big number"/multiprecision math operations. Work courtesy of Sebastian Andrzej Siewior.

  • Build system: Added CMake option DO_NOT_SET_RPATH to avoid setting RPATH on Unix systems. Feature courtesy of Sebastian Andrzej Siewior.

  • Build system: Enabled version-scripts with CMake to limit symbol exports for libclamav, libfreshclam, libclamunrar_iface, and libclamunrar shared libraries on Unix systems, excluding macOS. Improvement courtesy of Orion Poplawski and Sebastian Andrzej Siewior.

  • Build system: Enabled users to pass in custom Rust compiler flags using the RUSTFLAGS CMake variable. Feature courtesy of Orion Poplawski.

  • Removed a hard-coded alert for CVE-2004-0597. The CVE is old enough that it is no longer a threat and the detection had occasional false-positives.

  • Set Git attributes to prevent Git from altering line endings for Rust vendored libraries. Third-party Rust libraries are bundled in the ClamAV release tarball. We do not commit them to our own Git repository, but community package maintainers may now store the tarball contents in Git. The Rust build system verifies the library manifest, and this change ensures that the hashes are correct. Improvement courtesy of Nicolas R.

  • Fixed compile time warnings. Improvement courtesy of Răzvan Cojocaru.

  • Added a minor optimization when matching domain name regex signatures for PDB, WDB and CDB type signatures.

  • Build system: Enabled the ability to select a specific Python version. When building, you may use the CMake option -D PYTHON_FIND_VER=<version> to choose a specific Python version. Feature courtesy of Matt Jolly.

  • Added improvements to the ClamOnAcc process log output so that it is easier to diagnose bugs.

  • Windows: Enabled the MSI installer to upgrade between feature versions more easily when ClamAV is installed to a location different from the default (i.e., not C:\Program Files\ClamAV). This means that the MSI installer can find a previous ClamAV 1.0.x installation to upgrade to ClamAV 1.1.0.

  • Sigtool: Added the ability to change the location of the temp directory using the --tempdir option and added the ability to retain the temp files created by Sigtool using the --leave-temps option.

  • Other minor improvements.

Bug fixes

Acknowledgments

Special thanks to the following people for code contributions and bug reports:

  • Craig Andrews
  • Ged Haywood
  • Matt Jolly
  • Orion Poplawski
  • Nicolas R.
  • Răzvan Cojocaru
  • Red
  • Shawn Iverson
  • Sebastian Andrzej Siewior
  • The OSS-Fuzz project
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Thursday, March 23, 2023

ClamAV EOL of 0.104.x versions

Effective March 28, 2023, ClamAV 0.104.0 (and all patch versions) will no longer be supported in accordance with ClamAV's EOL policy. 

End of life (EOL) for ClamAV means: 

  • We will no longer be testing against that version when we write signatures. 
  • That version may no longer be working as part of future updates. 
  • Signature updates for that version will be blocked when attempting to download from the mirror update system. 

Please upgrade to a supported version of ClamAV, currently at 0.103.8, 0.105.2, and 1.0.1, available for download now.

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Wednesday, February 15, 2023

ClamAV 0.103.8, 0.105.2 and 1.0.1 patch versions published

 Today, we are releasing the following critical patch versions for ClamAV:

  • 0.103.8
  • 0.105.2
  • 1.0.1

ClamAV 0.104 has reached end-of-life according to the ClamAV End of Life (EOL) policy and will not be patched. Anyone using ClamAV 0.104 must switch to a supported version. All users should update as soon as possible to patch for the remote code execution vulnerability and remote information leak vulnerability.

Edit: We are aware that technical details for CVE-2023-20032 and a proof-of-concept sample to demonstrate the buffer overflow are publicly available.

The release files are available for download on ClamAV.net, on the Github Release page, and through Docker Hub.

1.0.1

ClamAV 1.0.1 is a critical patch release with the following fixes:

  • CVE-2023-20032: Fixed a possible remote code execution vulnerability in the HFS+ file parser. The issue affects versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier. Thank you to Simon Scannell for reporting this issue.

  • CVE-2023-20052: Fixed a possible remote information leak vulnerability in the DMG file parser. The issue affects versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier. Thank you to Simon Scannell for reporting this issue.

  • Fix an allmatch detection issue with the preclass bytecode hook.

  • Update the vendored libmspack library to version 0.11alpha.

0.105.2

ClamAV 0.105.2 is a critical patch release with the following fixes:

  • CVE-2023-20032: Fixed a possible remote code execution vulnerability in the HFS+ file parser. The issue affects versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier. Thank you to Simon Scannell for reporting this issue.

  • CVE-2023-20052: Fixed a possible remote information leak vulnerability in the DMG file parser. The issue affects versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier. Thank you to Simon Scannell for reporting this issue.

  • Fixed an issue loading Yara rules containing regex strings with an escaped forward-slash (\/) followed by a colon (:).

  • Moved the ClamAV Docker files for building containers to a new Git repository. The Docker files are now in https://github.com/Cisco-Talos/clamav-docker. This change enables us to fix issues with the images and with the supporting scripts used to publish and update the images without committing changes directly to files in the ClamAV release branches.

  • Update the vendored libmspack library to version 0.11alpha.

0.103.8

ClamAV 0.103.8 is a critical patch release with the following fixes:

  • CVE-2023-20032: Fixed a possible remote code execution vulnerability in the HFS+ file parser. The issue affects versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier. Thank you to Simon Scannell for reporting this issue.

  • CVE-2023-20052: Fixed a possible remote information leak vulnerability in the DMG file parser. The issue affects versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier. Thank you to Simon Scannell for reporting this issue.

  • Update the vendored libmspack library to version 0.11alpha.

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Monday, November 28, 2022

ClamAV 1.0.0 LTS released

The ClamAV 1.0.0 feature release is now stable and available for download on ClamAV.net or through Docker Hub.  

ClamAV 1.0.0 includes the following improvements and changes.

Major changes

  • Support for decrypting read-only OLE2-based XLS files that are encrypted with the default password. Use of the default password will now appear in the metadata JSON.

  • Overhauled the implementation of the all-match feature. The newer code is more reliable and easier to maintain.

    • This project fixed several known issues with signature detection in all- match mode:

      • Enabled embedded file-type recognition signatures to match when a malware signature also matched in a scan of the same layer.

      • Enabled bytecode signatures to run in all-match mode after a match has occurred.

      • Fixed an assortment of all-match edge case issues.

    • Added multiple test cases to verify correct all-match behavior.

    • GitHub pull request: https://github.com/Cisco-Talos/clamav/pull/687

  • Added a new callback to the public API for inspecting file content during a scan at each layer of archive extraction.

    • The new callback function type is clcb_file_inspection defined in clamav.h.

    • The function cl_engine_set_clcb_file_inspection() may be used to enable the callback prior to performing a scan.

    • This new callback is to be considered unstable for the 1.0 release. We may alter this function in a subsequent feature version.

    • GitHub pull request: https://github.com/Cisco-Talos/clamav/pull/170

  • Added a new function to the public API for unpacking CVD signature archives.

    • The new function is cl_cvdunpack(). The last parameter for the function may be set to verify if a CVD's signature is valid before unpacking the CVD content to the destination directory.

    • GitHub pull request: https://github.com/Cisco-Talos/clamav/pull/690

  • The option to build with an external TomsFastMath library has been removed. ClamAV requires non-default build options for TomsFastMath to support bigger floating point numbers. Without this change, database and Windows EXE/DLL authenticode certificate validation may fail. The ENABLE_EXTERNAL_TOMSFASTMATH build is now ignored.

  • Moved the Dockerfile and supporting scripts from the main ClamAV repository over to a new repository: https://github.com/Cisco-Talos/clamav-docker

    The separate repository will make it easier to update the images and fix issues with images for released ClamAV versions.

    Any users building the ClamAV Docker image rather than pulling them from Docker Hub will have to get the latest Docker files from the new location.

  • Increased the SONAME major version for libclamav because of ABI changes between the 0.103 LTS release and the 1.0 LTS release.

Other improvements

  • Add checks to limit PDF object extraction recursion.

  • Increased the limit for memory allocations based on untrusted input and altered the warning message when the limit is exceeded so that it is more helpful and less dramatic.

  • Dramatically improved the build time of libclamav-Rust unit tests. The unit test build is included in the time limit for the test itself and was timing out on slower systems. The ClamAV Rust code modules now share the same build directory, which also reduces the amount of disk space used for the build.

  • For Windows: The debugging symbol (PDB) files are now installed alongside the DLL and LIB library files when built in "RelWithDebInfo" or "Debug" mode.

  • Relaxed the constraints on the check for overlapping ZIP file entries so as not to alert on slightly malformed, but non-malicious, Java (JAR) archives.

  • Increased the time limit in FreshClam before warning if the DNS entry is stale. In combination with changes to update the DNS entry more frequently, this should prevent false alarms of failures in the database publication system.

  • Docker: The C library header files are now included in the Docker image. Patch courtesy of GitHub user TerminalFi.

  • Show the BYTECODE_RUNTIME build options when using the ccmake GUI for CMake. Patch courtesy of Дилян Палаузов.

  • Added explicit minimum and maximum supported LLVM versions so that the build will fail if you try to build with a version that is too old or too new and will print a helpful message rather than simply failing to compile because of compatibility issues. Patch courtesy of Matt Jolly.

  • Fixed compiler warnings that may turn into errors in Clang 16. Patch courtesy of Michael Orlitzky.

  • Allow building with a custom RPATH so that the executables may be moved after build in a development environment to a final installation directory.

Bug fixes

Acknowledgments

Special thanks to the following people for code contributions and bug reports:

  • Anthony Chan

  • Ben Bodenmiller

  • Дилян Палаузов

  • Liam Jarvis

  • Matt Jolly

  • Michael Orlitzky

  • monkz

  • teoberi

  • TerminalFi

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