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-rw-r--r--apt-pkg/contrib/fileutl.cc4
1 files changed, 3 insertions, 1 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 2b7e25080..a5976cf3a 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -138,7 +138,9 @@ bool CopyFile(FileFd &From,FileFd &To)
close at some time. */
int GetLock(string File,bool Errors)
{
- int FD = open(File.c_str(),O_RDWR | O_CREAT | O_TRUNC,0640);
+ // GetLock() is used in aptitude on directories with public-write access
+ // Use O_NOFOLLOW here to prevent symlink traversal attacks
+ int FD = open(File.c_str(),O_RDWR | O_CREAT | O_NOFOLLOW,0640);
if (FD < 0)
{
// Read only .. cant have locking problems there.