CVE-2025-54489

NameCVE-2025-54489
DescriptionA stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.This vulnerability manifests on line 8970 of biosig.c on the current master branch (35a819fa), when the Tag is 63: else if (tag==63) { uint8_t tag2=255, len2=255; count = 0; while ((count<len) && !(FlagInfiniteLength && len2==0 && tag2==0)){ curPos += ifread(&tag2,1,1,hdr); curPos += ifread(&len2,1,1,hdr); if (VERBOSE_LEVEL==9) fprintf(stdout,"MFER: tag=%3i chan=%2i len=%-4i tag2=%3i len2=%3i curPos=%i %li count=%4i\n",tag,chan,len,tag2,len2,curPos,iftell(hdr),(int)count); if (FlagInfiniteLength && len2==0 && tag2==0) break; count += (2+len2); curPos += ifread(&buf,1,len2,hdr); Here, the number of bytes read is not the Data Length decoded from the current frame in the file (`len`) but rather is a new length contained in a single octet read from the same input file (`len2`). Despite this, a stack-based buffer overflow condition can still occur, as the destination buffer is still `buf`, which has a size of only 128 bytes, while `len2` can be as large as 255.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1112133

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
biosig (PTS)bullseye2.1.2-4vulnerable
bookworm2.5.0-1vulnerable
forky, sid, trixie3.9.0-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
biosigsource(unstable)(unfixed)1112133

Notes

[trixie] - biosig <no-dsa> (Minor issue)
[bookworm] - biosig <no-dsa> (Minor issue)
[bullseye] - biosig <postponed> (Minor issue)
https://sourceforge.net/p/biosig/mailman/message/59224259/
https://sourceforge.net/p/biosig/code/ci/ba2f1c381b10f5ab50c94be3291b2560af0f7a96/

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