7.5 - DSA-404

Executive Summary

Summary
Title	New rsync packages fix unauthorised remote code execution

Informations
Name	DSA-404	First vendor Publication	2003-12-04
Vendor	Debian	Last vendor Modification	2003-12-04
Severity (Vendor)	N/A	Revision	1

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Cvss Base Score	7.5	Attack Range	Network
Cvss Impact Score	6.4	Attack Complexity	Low
Cvss Expoit Score	10	Authentication	None Required
Calculate full CVSS 2.0 Vectors scores

Detail

The rsync team has received evidence that a vulnerability in all versions of rsync prior to 2.5.7, a fast remote file copy program, was recently used in combination with a Linux kernel vulnerability to compromise the security of a public rsync server.

While this heap overflow vulnerability could not be used by itself to obtain root access on an rsync server, it could be used in combination with the recently announced do_brk() vulnerability in the Linux kernel to produce a full remote compromise.

Please note that this vulnerability only affects the use of rsync as an "rsync server". To see if you are running a rsync server you should use the command "netstat -a -n" to see if you are listening on TCP port 873. If you are not listening on TCP port 873 then you are not running an rsync server.

For the stable distribution (woody) this problem has been fixed in version 2.5.5-0.2.

For the unstable distribution (sid) this problem has been fixed in version 2.5.6-1.1.

However, since the Debian infrastructure is not yet fully functional after the recent break-in, packages for the unstable distribution are not able to enter the archive for a while. Hence they were placed in my home directory on the security machine:

We recommend that you upgrade your rsync package immediately if you are providing remote sync services. If you are running testing and provide remote sync services please use the packages for woody.