Details
Critical Description
CVE-2011-2729: Commons Daemon fails to drop capabilities
Severity: high
Vendor:
The Apache Software Foundation
Versions Affected:
Commons Daemon 1.0.3 to 1.0.6
Additionally, these vulnerabilities only occur when all of the
following are true:
a) running on Linux operating system
b) jsvc was compiled with libcap
c) -user parameter is used
Description:
Due to bug in capabilities code, jsvc does not drop capabilities
allowing the application to access files and directories owned by
superuser.
Mitigation:
Affected users of all versions can mitigate these vulnerabilities by
taking any of the following actions:
a) upgrade to a version where the vulnerabilities have been fixed
jsvc 1.0.3 - 1.0.6 users should upgrade to 1.0.7 version
b) do not use -user parameter to switch user
c) recompile the jsvc without libcap support
Example:
[root@fedora jsvctest]# ./jsvc -cp commons-daemon-1.0.6.jar:. -user jsvc ....
[root@fedora jsvctest]# grep ^Cap /proc/<pid>/status
CapInh: 0000000000000406
CapPrm: 0000000000000406
CapEff: 0000000000000406
CapBnd: ffffffffffffffff
[root@fedora jsvctest]# ./jsvc -cp commons-daemon-1.0.7.jar:. -user jsvc ....
[root@fedora jsvctest]# grep ^Cap /proc/<pid>/status
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: ffffffffffffffff
Credit:
This issue was identified by Wilfried Weissmann.