Chris Evans discovered several stack and integer overflows in the libXpm library which is included in LessTif.
For the stable distribution (woody) this problem has been fixed in version 0.93.18-5.
For the unstable distribution (sid) this problem has been fixed in version 0.93.94-10.
We recommend that you upgrade your lesstif packages.
MD5 checksums of the listed files are available in the original advisory.