Great !
PNG - GIF files, problem solved !
On 2/9/2021 1:06 PM, Joel Esler (jesler) via clamav-users wrote:
https://blog.clamav.net/2021/02/clamav-01031-patch-release.html
<https://blog.clamav.net/2021/02/clamav-01031-patch-release.html>
ClamAV 0.103.1 patch release
ClamAV 0.103.1 is out now. Users can head over to
clamav.net/downloads <https://www.clamav.net/downloads> to download
the release materials.
The latest version of ClamAV contains the following fixes and
improvements:
Notable changes
* Added a new scan option to alert on broken media (graphics) file
formats.
This feature mitigates the risk of malformed media files intended
to exploit vulnerabilities in other software. At present, media
validation exists for JPEG, TIFF, PNG and GIF files. To enable
this feature, set AlertBrokenMedia yes in clamd.conf for use with
ClamD, or use the --alert-broken-media option when using
ClamScan. These options are disabled by default in this patch
release but may be enabled in a subsequent release.
Application developers may enable this scan option by enabling
CL_SCAN_HEURISTIC_BROKEN_MEDIA for the heuristic scan option bit
field.
* Added CL_TYPE_TIFF, CL_TYPE_JPEG types to match GIF and PNG
typing behavior. BMP and JPEG 2000 files will continue to detect
as CL_TYPE_GRAPHICS because ClamAV does not yet have BMP or JPEG
2000 format-checking capabilities.
Bug fixes
* Fixed PNG parser logic bugs that caused an excess of parsing
errors and fixed a stack exhaustion issue affecting some systems
when scanning PNG files. PNG file type detection was disabled via
signature database update for ClamAV version 0.103.0 to mitigate
the effects from these bugs.
* Fixed an issue where PNG and GIF files no longer work with
Target:5 graphics signatures if detected as CL_TYPE_PNG or
CL_TYPE_GIF rather than as CL_TYPE_GRAPHICS. Target types now
support up to 10 possible file types to make way for additional
graphics types in future releases.
* Fixed ClamOnAcc's --fdpass option.
File descriptor passing (or "FD-passing") is a mechanism by which
ClamOnAcc and ClamDScan may transfer an open file to ClamD to
scan, even if ClamD is running as a non-privileged user and
wouldn't otherwise have read-access to the file. This enables
ClamD to scan all files without having to run ClamD as root. If
possible, ClamD should never be run as root to mitigate the risk
in case ClamD is somehow compromised while scanning malware.
Interprocess file descriptor passing for ClamOnAcc was broken
since version 0.102.0 due to a bug introduced by the switch to
cURL for communicating with ClamD. On Linux, passing file
descriptors from one process to another is handled by the kernel,
so we reverted ClamOnAcc to use standard system calls for socket
communication when FD-passing is enabled.
* Fixed a ClamOnAcc stack corruption issue on some systems when
using an older version of libcurl. Patch courtesy of Emilio
Pozuelo Monfort.
* Allow ClamScan and ClamDScan scans to proceed even if the
realpath lookup failed. This alleviates an issue on Windows
scanning files hosted on file-systems that do not support the
GetMappedFileNameW() API, such as on ImDisk RAM-disks.
* Fixed FreshClam's --on-update-execute=EXIT_1 temporary directory
cleanup issue.
* ClamD's log output and VirusEvent feature now provide the scan
target's file path instead of a file descriptor. The ClamD socket
API for submitting a scan by FD-passing doesn't include a file
path. This feature works by looking up the file path by the file
descriptor. This feature works on Mac and Linux but is not yet
implemented for other UNIX operating systems. FD-passing is not
available for Windows.
* Fixed an issue where FreshClam database validation didn't work
correctly when run in daemon mode on Linux/Unix.
* Fixed scan speed performance issues accidentally introduced in
ClamAV 0.103.0 caused by hashing file maps more than once when
parsing a file as a new type, and caused by frequent scanning of
non-HTML text data with the HTML parser.
Other improvements
* Scanning JPEG, TIFF, PNG and GIF files will no longer return
"parse" errors when file format validation fails. Instead, the
scan will alert with the "Heuristics.Broken.Media" signature
prefix and a descriptive suffix to indicate the issue, provided
that the "alert broken media" feature is enabled.
* GIF format validation will no longer fail if the GIF image is
missing the trailer byte, as this appears to be a relatively
common issue in otherwise functional GIFs.
* Added a TIFF dynamic configuration (DCONF) option that was
missing. This will allow us to disable TIFF format validation via
signature database update in the event that it proves to be
problematic. This feature already exists for many other file types.
Acknowledgments
The ClamAV team thanks Emilio Pozuelo Monfort for their code submissions.
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