From: Jehan Date: Wed, 20 Dec 2017 13:02:38 +0100 Subject: Bug 739134 - (CVE-2017-17786) Out of bounds read / heap overflow in... MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Origin: https://git.gnome.org/browse/GIMP/commit/?id=ef9c821fff8b637a2178eab1c78cae6764c50e12 Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-17786 Bug-Debian: https://bugs.debian.org/884862 Bug: https://bugzilla.gnome.org/show_bug.cgi?id=739134 ... TGA importer. Be more thorough on valid TGA RGB and RGBA images. In particular current TGA plug-in can import RGBA as 32 bits (8 bits per channel) and 16 bits (5 bits per color channel and 1 bit for alpha), and RGB as 15 and 24 bits. Maybe there exist more variants, but if they do exist, we simply don't support them yet. Thanks to Hanno Böck for the report and a first patch attempt. (cherry picked from commit 674b62ad45b6579ec6d7923dc3cb1ef4e8b5498b) --- plug-ins/common/file-tga.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/plug-ins/common/file-tga.c b/plug-ins/common/file-tga.c index aef98702d4..426acc2925 100644 --- a/plug-ins/common/file-tga.c +++ b/plug-ins/common/file-tga.c @@ -564,12 +564,16 @@ load_image (const gchar *filename, } break; case TGA_TYPE_COLOR: - if (info.bpp != 15 && info.bpp != 16 && - info.bpp != 24 && info.bpp != 32) + if ((info.bpp != 15 && info.bpp != 16 && + info.bpp != 24 && info.bpp != 32) || + ((info.bpp == 15 || info.bpp == 24) && + info.alphaBits != 0) || + (info.bpp == 16 && info.alphaBits != 1) || + (info.bpp == 32 && info.alphaBits != 8)) { - g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u)", + g_message ("Unhandled sub-format in '%s' (type = %u, bpp = %u, alpha = %u)", gimp_filename_to_utf8 (filename), - info.imageType, info.bpp); + info.imageType, info.bpp, info.alphaBits); return -1; } break; -- 2.15.1