NULL pointer dereference in LibTIFF - CVE-2019-7663
Published: February 14, 2019
Vulnerability identifier: #VU17675
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-7663
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an invalid address dereference condition that exists in the TIFFWriteDirectoryTagTransferfunction, as defined in the libtiff/tif_dirwrite.c source code file. A remote attacker can trick the victim into accessing a Tagged Image File Format (TIFF) file that submits malicious input and trigger a segmentation fault in the cpSeparateBufToContigBuf function in the tiffcp.c file, resulting in a DoS condition.
Affected software
LibTIFF
Arch Linux
Gentoo Linux
Opensuse
Fedora
tiff (Debian package)
libtiff
Arch Linux
Gentoo Linux
Opensuse
Fedora
tiff (Debian package)
libtiff
How to mitigate CVE-2019-7663
Install updates from vendor's website.
tiff (Debian package) - update to 4.0.8-2+deb9u5
libtiff - update to 4.0.10-4.fc29
libtiff - update to 4.0.10-4.fc29