svnwcsub.py in Subversion 1.8.0 before 1.8.3, when using the --pidfile option and running in foreground mode, allows local users to gain privileges via a symlink attack on the pid file. NOTE: this issue was SPLIT due to different affected versions (ADT3). The irkerbridge.py issue is covered by CVE-2013-7393.
https://subversion.apache.org/security/CVE-2013-4262-advisory.txt
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html