Clam 2498 make image fuzzy hashing optional; Clam 2532 --force-to-disk missing documentation #1186
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Image fuzzy hashing is enabled by default. The following options have been added to allow users to disable it, if desired. New clamscan options: --scan-image[=yes(*)/no] --scan-image-fuzzy-hash[=yes(*)/no] New clamd config options: ScanImage yes(*)/no ScanImageFuzzyHash yes(*)/no New libclamav scan options: options.parse &= ~CL_SCAN_PARSE_IMAGE; options.parse &= ~CL_SCAN_PARSE_IMAGE_FUZZY_HASH; This commit also changes scan behavior to disable image fuzzy hashing for specific types when the DCONF (.cfg) signatures disable those types. That is, if DCONF disables the PNG parser, it should not only disable the CVE/format checker for PNG files, but also disable image fuzzy hashing for PNG files. Also adds a DCONF option to disable image fuzzy hashing: OTHER_CONF_IMAGE_FUZZY_HASH DCONF allows scanning features to be disabled using a configuration "signature".
The --force-to-disk option is missing from the clamscan --help and clamscan manpage documentation. Also change clamd.conf.sample suggestions to differ the from default settings so that the sample is easier to use.
Use the existing clamscan image fuzzy hash tests to verify that both --scan-image=no and also --scan-image-fuzzy-hash=no will disable image fuzzy hash based detection (at least for PNG files).
|
verified that force-to-disk is there. |
ragusaa
approved these changes
Mar 7, 2024
mtremer
pushed a commit
to ipfire/ipfire-2.x
that referenced
this pull request
Jan 9, 2025
- Update from version 1.3.2 to 1.4.1
- Update of rootfile
- Changelog
1.4.1
ClamAV 1.4.1 is a critical patch release with the following fixes:
- [CVE-2024-20506](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-20506):
Changed the logging module to disable following symlinks on Linux and Unix
systems so as to prevent an attacker with existing access to the 'clamd' or
'freshclam' services from using a symlink to corrupt system files.
This issue affects all currently supported versions. It will be fixed in:
- 1.4.1
- 1.3.2
- 1.0.7
- 0.103.12
Thank you to Detlef for identifying this issue.
- [CVE-2024-20505](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-20505):
Fixed a possible out-of-bounds read bug in the PDF file parser that could
cause a denial-of-service (DoS) condition.
This issue affects all currently supported versions. It will be fixed in:
- 1.4.1
- 1.3.2
- 1.0.7
- 0.103.12
Thank you to OSS-Fuzz for identifying this issue.
- Removed unused Python modules from freshclam tests including deprecated
'cgi' module that is expected to cause test failures in Python 3.13.
1.4.0
Major changes
- Added support for extracting ALZ archives.
The new ClamAV file type for ALZ archives is `CL_TYPE_ALZ`.
Added a [DCONF](https://docs.clamav.net/manual/Signatures/DynamicConfig.html)
option to enable or disable ALZ archive support.
> _Tip_: DCONF (Dynamic CONFiguration) is a feature that allows for some
> configuration changes to be made via ClamAV `.cfg` "signatures".
- [GitHub pull request](Cisco-Talos/clamav#1183)
- Added support for extracting LHA/LZH archives.
The new ClamAV file type for LHA/LZH archives is `CL_TYPE_LHA_LZH`.
Added a [DCONF](https://docs.clamav.net/manual/Signatures/DynamicConfig.html)
option to enable or disable LHA/LZH archive support.
- [GitHub pull request](Cisco-Talos/clamav#1192)
- Added the ability to disable image fuzzy hashing, if needed. For context,
image fuzzy hashing is a detection mechanism useful for identifying malware
by matching images included with the malware or phishing email/document.
New ClamScan options:
```
--scan-image[=yes(*)/no]
--scan-image-fuzzy-hash[=yes(*)/no]
```
New ClamD config options:
```
ScanImage yes(*)/no
ScanImageFuzzyHash yes(*)/no
```
New libclamav scan options:
```c
options.parse &= ~CL_SCAN_PARSE_IMAGE;
options.parse &= ~CL_SCAN_PARSE_IMAGE_FUZZY_HASH;
```
Added a [DCONF](https://docs.clamav.net/manual/Signatures/DynamicConfig.html)
option to enable or disable image fuzzy hashing support.
- [GitHub pull request](Cisco-Talos/clamav#1186)
Other improvements
- Added cross-compiling instructions for targeting ARM64/aarch64 processors for
[Windows](https://github.com/Cisco-Talos/clamav/blob/main/INSTALL-cross-windows-arm64.md)
and
[Linux](https://github.com/Cisco-Talos/clamav/blob/main/INSTALL-cross-linux-arm64.md).
- [GitHub pull request](Cisco-Talos/clamav#1116)
- Improved the Freshclam warning messages when being blocked or rate limited
so as to include the Cloudflare Ray ID, which helps with issue triage.
- [GitHub pull request](Cisco-Talos/clamav#1195)
- Removed unnecessary memory allocation checks when the size to be allocated
is fixed or comes from a trusted source.
We also renamed internal memory allocation functions and macros, so it is
more obvious what each function does.
- [GitHub pull request](Cisco-Talos/clamav#1137)
- Improved the Freshclam documentation to make it clear that the `--datadir`
option must be an absolute path to a directory that already exists, is
writable by Freshclam, and is readable by ClamScan and ClamD.
- [GitHub pull request](Cisco-Talos/clamav#1199)
- Added an optimization to avoid calculating the file hash if the clean file
cache has been disabled. The file hash may still be calculated as needed to
perform hash-based signature matching if any hash-based signatures exist that
target a file of the same size, or if any hash-based signatures exist that
target "any" file size.
- [GitHub pull request](Cisco-Talos/clamav#1167)
- Added an improvement to the SystemD service file for ClamOnAcc so that the
service will shut down faster on some systems.
- [GitHub pull request](Cisco-Talos/clamav#1164)
- Added a CMake build dependency on the version map files so that the build
will re-run if changes are made to the version map files.
Work courtesy of Sebastian Andrzej Siewior.
- [GitHub pull request](Cisco-Talos/clamav#1294)
- Added an improvement to the CMake build so that the RUSTFLAGS settings
are inherited from the environment.
Work courtesy of liushuyu.
- [GitHub pull request](Cisco-Talos/clamav#1301)
Bug fixes
- Silenced confusing warning message when scanning some HTML files.
- [GitHub pull request](Cisco-Talos/clamav#1252)
- Fixed minor compiler warnings.
- [GitHub pull request](Cisco-Talos/clamav#1197)
- Since the build system changed from Autotools to CMake, ClamAV no longer
supports building with configurations where bzip2, libxml2, libz, libjson-c,
or libpcre2 are not available. Libpcre is no longer supported in favor of
libpcre2. In this release, we removed all the dead code associated with those
unsupported build configurations.
- [GitHub pull request](Cisco-Talos/clamav#1217)
- Fixed assorted typos. Patch courtesy of RainRat.
- [GitHub pull request](Cisco-Talos/clamav#1228)
- Added missing documentation for the ClamScan `--force-to-disk` option.
- [GitHub pull request](Cisco-Talos/clamav#1186)
- Fixed an issue where ClamAV unit tests would prefer an older
libclamunrar_iface library from the install path, if present, rather than
the recently compiled library in the build path.
- [GitHub pull request](Cisco-Talos/clamav#1258)
- Fixed a build issue on Windows with newer versions of Rust.
Also upgraded GitHub Actions imports to fix CI failures.
Fixes courtesy of liushuyu.
- [GitHub pull request](Cisco-Talos/clamav#1307)
- Fixed an unaligned pointer dereference issue on select architectures.
Fix courtesy of Sebastian Andrzej Siewior.
- [GitHub pull request](Cisco-Talos/clamav#1293)
- Fixed a bug that prevented loading plaintext (non-CVD) signature files
when using the `--fail-if-cvd-older-than=DAYS` / `FailIfCvdOlderThan` option.
Fix courtesy of Bark.
- [GitHub pull request](Cisco-Talos/clamav#1309)
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Image fuzzy hashing is enabled by default. The following options have been added to allow users to disable it, if desired.
New clamscan options:
New clamd config options:
New libclamav scan options:
This commit also changes scan behavior to disable image fuzzy hashing for specific types when the DCONF (.cfg) signatures disable those types. That is, if DCONF disables the PNG parser, it should not only disable the CVE/format checker for PNG files, but also disable image fuzzy hashing for PNG files.
Also adds a DCONF option to disable image fuzzy hashing:
OTHER_CONF_IMAGE_FUZZY_HASHDCONF allows scanning features to be disabled using a configuration "signature".
This PR also adds
--force-to-diskoption missing from theclamscan --helpand clamscan manpage documentation.