Details at $URL. @maintainer(s): after the bump, in case we need to stabilize the package, please let us know if it is ready for the stabilization or not.
CVE-2017-7602 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7602): LibTIFF 4.0.7 has a signed integer overflow, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image. CVE-2017-7601 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7601): LibTIFF 4.0.7 has a "shift exponent too large for 64-bit type long" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image. CVE-2017-7600 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7600): LibTIFF 4.0.7 has an "outside the range of representable values of type unsigned char" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image. CVE-2017-7599 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7599): LibTIFF 4.0.7 has an "outside the range of representable values of type short" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image. CVE-2017-7598 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7598): tif_dirread.c in LibTIFF 4.0.7 might allow remote attackers to cause a denial of service (divide-by-zero error and application crash) via a crafted image. CVE-2017-7597 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7597): tif_dirread.c in LibTIFF 4.0.7 has an "outside the range of representable values of type float" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image. CVE-2017-7596 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7596): LibTIFF 4.0.7 has an "outside the range of representable values of type float" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image.
All listed vulnerabilities from this bug report are fixed in v4.0.8. Stabilization will happen in bug 618610.
This issue was resolved and addressed in GLSA 201709-27 at https://security.gentoo.org/glsa/201709-27 by GLSA coordinator Aaron Bauman (b-man).