CVE-2019-7663 Null dereference in n/a

What is CVE-2019-7663?

CVE-2019-7663 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 9 Feb 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

An Invalid Address dereference was discovered in TIFFWriteDirectoryTagTransferfunction in libtiff/tif_dirwrite.c in LibTIFF 4.0.10, affecting the cpSeparateBufToContigBuf function in tiffcp.c. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted tiff file. This is different from CVE-2018-12900.

Which versions are affected by CVE-2019-7663?

It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Libtiff Libtiff, Opensuse Leap.

How do I fix CVE-2019-7663?

Upgrade to a fixed version.

Is CVE-2019-7663 being exploited?

There is no known exploitation of CVE-2019-7663 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-7663, GHSA-26x4-fg42-26fj, JLSEC-2025-252, MGASA-2019-0101, UBUNTU-CVE-2019-7663.