Vulnerabilities > CVE-2018-19637 - Link Following vulnerability in Opensuse Supportutils 3.0.1095.51.1

047910
CVSS 5.5 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
NONE
Integrity impact
HIGH
Availability impact
NONE
local
low complexity
opensuse
CWE-59
nessus

Summary

Supportutils, before version 3.1-5.7.1, wrote data to static file /tmp/supp_log, allowing local attackers to overwrite files on systems without symlink protection

Vulnerable Configurations

Part Description Count
Application
Opensuse
1

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Symlink Attack
    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 be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. 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.

Nessus

  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-293.NASL
    descriptionThis update for supportutils fixes the following issues : Security issues fixed : - CVE-2018-19640: Fixed an issue where users could kill arbitrary processes (bsc#1118463). - CVE-2018-19638: Fixed an issue where users could overwrite arbitrary log files (bsc#1118460). - CVE-2018-19639: Fixed a code execution if run with -v (bsc#1118462). - CVE-2018-19637: Fixed an issue where static temporary filename could allow overwriting of files (bsc#1117776). Other issues fixed : - Fixed invalid exit code commands (bsc#1125666). - Included additional SUSE separation (bsc#1125609). - Merged added listing of locked packes by zypper. - Exclude pam.txt per GDPR by default (bsc#1112461).	 - Clarified -x functionality in supportconfig(8) (bsc#1115245).	 - udev service and provide the whole journal content in supportconfig (bsc#1051797). - supportconfig collects tuned profile settings (bsc#1071545). - sfdisk -d no disk device specified (bsc#1043311). - Added vulnerabilites status check in basic-health.txt (bsc#1105849). - Added only sched_domain from cpu0. - Blacklist sched_domain from proc.txt (bsc#1046681). - Added firewall-cmd info. - Add ls -lA --time-style=long-iso /etc/products.d/ - Dump lsof errors. - Added corosync status to ha_info. - Dump find errors in ib_info. This update was imported from the SUSE:SLE-15:Update update project.
    last seen2020-06-01
    modified2020-06-02
    plugin id122643
    published2019-03-06
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122643
    titleopenSUSE Security Update : supportutils (openSUSE-2019-293)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-1351.NASL
    descriptionThis update for hostinfo, supportutils fixes the following issues: 	 Security issues fixed for supportutils : - CVE-2018-19640: Fixed an issue where users could kill arbitrary processes (bsc#1118463). - CVE-2018-19638: Fixed an issue where users could overwrite arbitrary log files (bsc#1118460). - CVE-2018-19639: Fixed a code execution if run with -v (bsc#1118462). - CVE-2018-19637: Fixed an issue where static temporary filename could allow overwriting of files (bsc#1117776). - CVE-2018-19636: Fixed a local root exploit via inclusion of attacker controlled shell script (bsc#1117751). Other issues fixed for supportutils : - Fixed invalid exit code commands (bsc#1125666) - SUSE separation in supportconfig (bsc#1125623) - Clarified supportconfig(8) -x option (bsc#1115245) - supportconfig: 3.0.127 - btrfs filesystem usage - List products.d - Dump lsof errors - Added ha commands for corosync - Dumped find errors in ib_info Issues fixed in hostinfo : - Removed extra kernel install dates (bsc#1099498) - Resolved network bond issue (bsc#1054979) This update was imported from the SUSE:SLE-12:Update update project.
    last seen2020-06-01
    modified2020-06-02
    plugin id124712
    published2019-05-09
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/124712
    titleopenSUSE Security Update : hostinfo / supportutils (openSUSE-2019-1351)