Vulnerability in zchunk

[ Description ]Official description

zchunk before 1.5.5 contains a heap out-of-bounds read vulnerability in read_preface() in src/lib/header.c that passes the total header length instead of remaining bytes to compint parsing functions. Attackers can supply a crafted .zck file whose header ends inside a compressed integer, causing reads past the heap header buffer and crashing the application.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/zchunk/zchunk
• github.com/zchunk/zchunk/blob/1.5.4/src/lib/header.c
• github.com/zchunk/zchunk/commit/02b371a64bf98245df97315d07c684a0ca5ea1df
• github.com/zchunk/zchunk/issues/119
• github.com/zchunk/zchunk/releases/tag/1.5.5
• www.vulncheck.com/advisories/zchunk-before-1.5.5-heap-out-of-bounds-read-via-read-preface