CHMlib: User-assisted remote execution of arbitrary code

CHMlib: User-assisted remote execution of arbitrary code A memory corruption vulnerability in CHMlib could lead to the remote execution of arbitrary code. CHMlib February 27, 2007 May 20, 2008: 02 163989 remote 0.39 0.39

CHMlib is a library for the MS CHM (Compressed HTML) file format plus extracting and HTTP server utils.

When certain CHM files that contain tables and objects stored in pages are parsed by CHMlib, an unsanitized value is passed to the alloca() function resulting in a shift of the stack pointer to arbitrary memory locations.

An attacker could entice a user to open a specially crafted CHM file, resulting in the execution of arbitrary code with the permissions of the user viewing the file.

There is no known workaround at this time.

All CHMlib users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/chmlib-0.39"

Original Advisory CVE-2007-0619 falco falco daxomatic