fig2dev buffer overflow vulnerability (CNVD-2021-79767)

fig2dev is used to convert .fig files to various graphics languages and formats. A global buffer overflow vulnerability exists in shade_or_tint_name_after_declare_color in genpstricks.c in fig2dev version 3.2.7b. An attacker could exploit this vulnerability to cause a denial of service by converting the xfig file to pstricks format.