For the oldstable distribution (wheezy), these problems have been fixed in version 4.0.7-5+deb7u4. The oldstable distribution (wheezy) is only affected by CVE-2015-5475.
For the stable distribution (jessie), these problems have been fixed in version 4.2.8-3+deb8u1.
For the unstable distribution (sid), these problems have been fixed in version 4.2.11-2.
We recommend that you upgrade your request-tracker4 packages.