#ClamAV 0.103.4 and 0.104.1 patch releases

ClamAV 0.103.4 LTS and 0.104.1 patch versions are out now. Both of these can be found on clamav.net/downloads, with 0.104.1 as the main release and 0.103.4 under "Previous Stable Releases."

0.103.4

ClamAV 0.103.4 is a critical patch release with the following fixes:

FreshClam:
    Add a 24-hour cool-down for FreshClam clients that have received an HTTP 403 (Forbidden) response from the CDN. This is to reduce the volume of 403-response data served to blocked FreshClam clients that are configured with a tight update-loop.
    Fixed a bug where FreshClam treats an empty CDIFF as an incremental update failure instead of as an intentional request to download the whole CVD.

ClamDScan: Fix a scan error when broken symlinks are encountered on macOS with "FollowDirectorySymlinks" and "FollowFileSymlinks" options disabled.

Overhauled the scan recursion / nested archive extraction logic and added new limits on embedded file-type recognition performed during the "raw" scan of each file. This limits embedded file-type misidentification and prevents detecting embedded file content that is found/extracted and scanned at other layers in the scanning process.

Fix an issue with the FMap module that failed to read from some nested files.

Fixed an issue where failing to load some rules from a Yara file containing multiple rules may cause a crash.

Fixed assorted compiler warnings.

Fixed assorted Coverity static code analysis issues.

Scan limits:
    Added virus-name suffixes to the alerts that trigger when a scan limit has been exceeded. Rather than simply Heuristics.Limits.Exceeded, you may now see limit-specific virus-names, to include:
        Heuristics.Limits.Exceeded.MaxFileSize
        Heuristics.Limits.Exceeded.MaxScanSize
        Heuristics.Limits.Exceeded.MaxFiles
        Heuristics.Limits.Exceeded.MaxRecursion
        Heuristics.Limits.Exceeded.MaxScanTime
    Renamed the Heuristics.Email.ExceedsMax.* alerts to align with the other limit alerts names. These alerts include:
        Heuristics.Limits.Exceeded.EmailLineFoldcnt
        Heuristics.Limits.Exceeded.EmailHeaderBytes
        Heuristics.Limits.Exceeded.EmailHeaders
        Heuristics.Limits.Exceeded.EmailMIMEPartsPerMessage
        Heuristics.Limits.Exceeded.EmailMIMEArguments
    Fixed an issue where the Email-related scan limits would alert even when the "AlertExceedsMax" (--alert-exceeds-max) scan option is not enabled.
    Fixes an issue in the Zip parser where exceeding the "MaxFiles" limit or the "MaxFileSize" limit would abort the scan but would fail to alert. The Zip scan limit issues were independently identified and reported by Aaron Leliaert and Max Allan.

Fixed a leak in the Email parser when using the --gen-json scan option.

Fixed an issue where a failure to record metadata in the Email parser when using the --gen-json scan option could cause the Email parser to abort the scan early and fail to extract and scan additional content.

Fixed a file name memory leak in the Zip parser.

Fixed an issue where certain signature patterns may cause a crash or cause unintended matches on some systems when converting characters to uppercase if a UTF-8 unicode single-byte grapheme becomes a multi-byte grapheme. Patch courtesy of Andrea De Pasquale.

Other fixes backported from 0.104.0:

Fixed a crash in programs that use libclamav when the programs don't set a callback for the "virus found" event. Patch courtesy of Markus Strehle.

Added checks to the the SIS archive parser to prevent an SIS file entry from pointing to the archive, which would result in a loop. This was not an actual infinite loop, as ClamAV's scan recursion limit limits the depth of nested archive extraction.

ClamOnAcc: Fixed a socket file descriptor leak that could result in a crash when all available file descriptors are exhausted.

FreshClam: Fixed an issue where FreshClam would download a CVD repeatedly if a zero-byte CDIFF is downloaded or if the incremental update failed and if the CVD downloaded after that is older than advertised. Patch courtesy of Andrew Williams.

ClamDScan:
    Fixed a memory leak of the scan target filename when using the --fdpass or --stream options.
    Fixed an issue where ClamDScan would fail to scan any file after excluding a file with the "ExcludePath" option when using when using the --multiscan (-m) option along with either --fdpass or --stream. Also fixed a memory leak of the accidentally-excluded paths in this case.
    Fixed a single file path memory leak when using --fdpass.
    Fixed an issue where the "ExcludePath" regex may fail to exclude absolute paths when the scan is invoked with a relative path.

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

Aaron Leliaert
Andrea De Pasquale
Andrew Williams
Markus Strehle
Max Allan

0.104.1

ClamAV 0.104.1 is a critical patch release with the following fixes:

FreshClam:
    Add a 24-hour cool-down for FreshClam clients that have received an HTTP 403 (Forbidden) response from the CDN. This is to reduce the volume of 403-response data served to blocked FreshClam clients that are configured with a tight update-loop.
    Fixed a bug where FreshClam treats an empty CDIFF as an incremental update failure instead of as an intentional request to download the whole CVD.

ClamDScan: Fix a scan error when broken symlinks are encountered on macOS with "FollowDirectorySymlinks" and "FollowFileSymlinks" options disabled.

Overhauled the scan recursion / nested archive extraction logic and added new limits on embedded file-type recognition performed during the "raw" scan of each file. This limits embedded file-type misidentification and prevents detecting embedded file content that is found/extracted and scanned at other layers in the scanning process.

Fix an issue with the FMap module that failed to read from some nested files.

Fixed an issue where failing to load some rules from a Yara file containing multiple rules may cause a crash.

Fixed assorted compiler warnings.

Fixed assorted Coverity static code analysis issues.

Scan limits:
    Added virus-name suffixes to the alerts that trigger when a scan limit has been exceeded. Rather than simply Heuristics.Limits.Exceeded, you may now see limit-specific virus-names, to include:
        Heuristics.Limits.Exceeded.MaxFileSize
        Heuristics.Limits.Exceeded.MaxScanSize
        Heuristics.Limits.Exceeded.MaxFiles
        Heuristics.Limits.Exceeded.MaxRecursion
        Heuristics.Limits.Exceeded.MaxScanTime
    Renamed the Heuristics.Email.ExceedsMax.* alerts to align with the other limit alerts names. These alerts include:
        Heuristics.Limits.Exceeded.EmailLineFoldcnt
        Heuristics.Limits.Exceeded.EmailHeaderBytes
        Heuristics.Limits.Exceeded.EmailHeaders
        Heuristics.Limits.Exceeded.EmailMIMEPartsPerMessage
        Heuristics.Limits.Exceeded.EmailMIMEArguments
    Fixed an issue where the Email-related scan limits would alert even when the "AlertExceedsMax" (--alert-exceeds-max) scan option is not enabled.
    Fixes an issue in the Zip parser where exceeding the "MaxFiles" limit or the "MaxFileSize" limit would abort the scan but would fail to alert. The Zip scan limit issues were independently identified and reported by Aaron Leliaert and Max Allan.

Fixed a leak in the Email parser when using the --gen-json scan option.

Fixed an issue where a failure to record metadata in the Email parser when using the --gen-json scan option could cause the Email parser to abort the scan early and fail to extract and scan additional content.

Fixed a file name memory leak in the Zip parser.

Fixed an issue where certain signature patterns may cause a crash or cause unintended matches on some systems when converting characters to uppercase if a UTF-8 unicode single-byte grapheme becomes a multi-byte grapheme. Patch courtesy of Andrea De Pasquale.

CMake:
    Fix a packaging issue with the Windows *.msi installer so that it will include all of the required files.
    Add support for developer code-signing on macOS during the build.
    Fix an issue finding and linking with the tinfo library on systems where tinfo is separate from ncurses. Patch courtesy of Luca Barbato.

Tests: Improved the Freshclam incremental update tests to verify correct behavior when a zero-byte CDIFF is downloaded and the CVD served to FreshClam is older than advertised.

Docker: Remove the freshclam.dat file when building the Docker image with the databases-included so FreshClam agents running in the container will have a unique ID in the HTTP User-Agent.

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

Aaron Leliaert
Andrea De Pasquale
Luca Barbato
Max Allan 

https://blog.clamav.net/2021/11/clamav-01034-and-01041-patch-releases.html