Debian Security Advisory
DSA-2234-1 zodb -- several vulnerabilities
- Date Reported:
- 10 May 2011
- Affected Packages:
- Security database references:
- In the Debian bugtracking system: Bug 540465.
In Mitre's CVE dictionary: CVE-2009-0668, CVE-2009-0669.
- More information:
Several remote vulnerabilities have been discovered in python-zodb, a set of tools for using ZODB, that could lead to arbitrary code execution in the worst case. The Common Vulnerabilities and Exposures project identifies the following problems:
The ZEO server doesn't restrict the callables when unpickling data received from a malicious client which can be used by an attacker to execute arbitrary Python code on the server by sending certain exception pickles. This also allows an attacker to import any importable module as ZEO is importing the module containing a callable specified in a pickle to test for a certain flag.
Due to a programming error, an authorization method in the StorageServer component of ZEO was not used as an internal method. This allows a malicious client to bypass authentication when connecting to a ZEO server by simply calling this authorization method.
The update also limits the number of new object ids a client can request to 100 as it would be possible to consume huge amounts of resources by requesting a big batch of new object ids. No CVE id has been assigned to this.
For the oldstable distribution (lenny), this problem has been fixed in version 1:3.6.0-2+lenny3.
The stable distribution (squeeze) is not affected, it was fixed before the initial release.
For the unstable distribution (sid), this problem has been fixed in version 1:3.8.2-1.
We recommend that you upgrade your zodb packages.