* apt-pkg/acquire-item.cc:

  - remove 'old' InRelease file if we can't get a new one before
    proceeding with Release.gpg to avoid the false impression of a still
    trusted repository by a (still present) old InRelease file.
    Thanks to Simon Ruderich for reporting this issue! (CVE-2012-0214)

Effected are all versions >= 0.8.11

Possible attack summary:
- Attacker needs to find a user which has run at least one successful
 'apt-get update' against an archive providing InRelease files.
- Create a Packages file with his preferred content.
- Attacker then prevents the download of InRelease, Release and
  Release.gpg (alternatively he creates a valid Release file and sends
  this, the other two files need to be missing either way).
- User updates against this, getting the modified Packages file without
  any indication of being unsigned (beside the "Ign InRelease" and
  "Ign Release.gpg" in the output of 'apt-get update').
=> deb files from this source are considered 'trusted' (and therefore the
   user isn't asked for an additional confirmation before install)

diff --git a/apt-pkg/acquire-item.cc b/apt-pkg/acquire-item.cc
index 4e6fb7ff9718ecbf95502a3e3b1fd27a5902ca7b..545a57d3733ea0e6aa0ae7f8961ad0de7cdd530e 100644 (file)
--- a/apt-pkg/acquire-item.cc
+++ b/apt-pkg/acquire-item.cc
@@ -1598,6 +1598,13 @@ void pkgAcqMetaClearSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf) /*
 {
    if (AuthPass == false)
    {
+      // Remove the 'old' InRelease file if we try Release.gpg now as otherwise
+      // the file will stay around and gives a false-auth impression (CVE-2012-0214)
+      string FinalFile = _config->FindDir("Dir::State::lists");
+      FinalFile.append(URItoFileName(RealURI));
+      if (FileExists(FinalFile))
+        unlink(FinalFile.c_str());
+
       new pkgAcqMetaSig(Owner,
                        MetaSigURI, MetaSigURIDesc, MetaSigShortDesc,
                        MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,

diff --git a/debian/changelog b/debian/changelog
index 6cd2e70a766c8f92df07bea6a5e3f92f21733f56..4af60dc618c3c3bec71ef5dbb5a7c53807b5673d 100644 (file)
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,11 @@
 apt (0.8.16~exp13) UNRELEASED; urgency=low
 
   [ David Kalnischkies ]
+  * apt-pkg/acquire-item.cc:
+    - remove 'old' InRelease file if we can't get a new one before
+      proceeding with Release.gpg to avoid the false impression of a still
+      trusted repository by a (still present) old InRelease file.
+      Thanks to Simon Ruderich for reporting this issue! (CVE-2012-0214)
   * apt-pkg/deb/dpkgpm.cc:
     - chroot if needed before dpkg --assert-multi-arch
     - ensure that dpkg binary doesn't have the chroot-directory prefixed
@@ -65,7 +70,7 @@ apt (0.8.16~exp13) UNRELEASED; urgency=low
   * apt-pkg/contrib/fileutl.h:
     - fix compat with FileFd::OpenDescriptor() in ReadOnlyGzip mode
 
- -- David Kalnischkies <kalnischkies@gmail.com>  Sat, 03 Mar 2012 11:03:58 +0100
+ -- David Kalnischkies <kalnischkies@gmail.com>  Sun, 04 Mar 2012 22:40:27 +0100
 
 apt (0.8.16~exp12) experimental; urgency=low