dpkg-source in dpkg 1.3.0 through 1.18.23 is able to use a non-GNU patch program and does not offer a protection mechanism for blank-indented diff hunks, which allows remote attackers to conduct directory traversal attacks via a crafted Debian source package, as demonstrated by use of dpkg-source on NetBSD.

References

• https://nvd.nist.gov/vuln/detail/CVE-2017-8283
• http://www.openwall.com/lists/oss-security/2017/04/20/2
• http://www.securityfocus.com/bid/98064