SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200804-15 (libpng: Execution of arbitrary code)
Tavis Ormandy of the Google Security Team discovered that libpng does not handle zero-length unknown chunks in PNG files correctly, which might lead to memory corruption in applications that call png_set_read_user_chunk_fn() or png_set_keep_unknown_chunks().
A remote attacker could entice a user or automated system to process a specially crafted PNG image in an application using libpng and possibly execute arbitrary code with the privileges of the user running the application. Note that processing of unknown chunks is disabled by default in most PNG applications, but some such as ImageMagick are affected.
There is no known workaround at this time.
SolutionAll libpng users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=media-libs/libpng-1.2.26-r1'