||The make_lockdir_name function in policy.c in pmount 0.9.18 allow local users to overwrite arbitrary files via a symlink attack on a file in /var/lock/.
|Base: ||1.9 (as of 21-06-2010 - 09:44)|
An attacker positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name. The endpoint file may be either output or input. If the file is output, the result is that the endpoint is modified, instead of a file at the intended location. Modifications to the endpoint file may include appending, overwriting, corrupting, changing permissions, or other modifications. In some variants of this attack the attacker may be able to control the change to a file while in other cases they cannot. The former is especially damaging since the attacker may be able to grant themselves increased privileges or insert false information, but the latter can also be damaging as it can expose sensitive information or corrupt or destroy vital system or application files. Alternatively, the endpoint file may serve as input to the targeted application. This can be used to feed malformed input into the target or to cause the target to process different information, possibly allowing the attacker to control the actions of the target or to cause the target to expose information to the attacker. Moreover, the actions taken on the endpoint file are undertaken with the permissions of the targeted user or application, which may exceed the permissions that the attacker would normally have.
Accessing, Modifying or Executing Executable Files
An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
Leverage Executable Code in Non-Executable Files
An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality.
The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
Manipulating Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
|NASL family||Debian Local Security Checks |
|NASL id||DEBIAN_DSA-2063.NASL |
|description||Dan Rosenberg discovered that pmount, a wrapper around the standard mount program which permits normal users to mount removable devices without a matching /etc/fstab entry, creates files in /var/lock insecurely. A local attacker could overwrite arbitrary files utilising a symlink attack. |
|last seen||2019-02-21 |
|plugin id||47105 |
|title||Debian DSA-2063-1 : pmount - insecure temporary file |
|NASL family||Gentoo Local Security Checks |
|NASL id||GENTOO_GLSA-201412-08.NASL |
|description||The remote host is affected by the vulnerability described in GLSA-201412-08 (Multiple packages, Multiple vulnerabilities fixed in 2010)
Vulnerabilities have been discovered in the packages listed below.
Please review the CVE identifiers in the Reference section for details.
Insight Perl Tk Module Source-Navigator Tk Partimage Mlmmj acl Xinit gzip ncompress liblzw splashutils GNU M4 KDE Display Manager GTK+ KGet dvipng Beanstalk Policy Mount pam_krb5 GNU gv LFTP Uzbl Slim Bitdefender Console iputils DVBStreamer Impact :
A context-dependent attacker may be able to gain escalated privileges, execute arbitrary code, cause Denial of Service, obtain sensitive information, or otherwise bypass security restrictions.
There are no known workarounds at this time. |
|last seen||2019-02-21 |
|plugin id||79961 |
|title||GLSA-201412-08 : Multiple packages, Multiple vulnerabilities fixed in 2010 |
|Last major update
||22-06-2010 - 01:41
||18-06-2010 - 12:30