main.c in Tinyproxy 1.8.4 and earlier creates a /run/tinyproxy/tinyproxy.pid file after dropping privileges to a non-root account, which might allow local users to kill arbitrary processes by leveraging access to this non-root account for tinyproxy.pid modification before a root script executes a "kill `cat /run/tinyproxy/tinyproxy.pid`" command.

The remote openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2024:0119-1 advisory.

    - Update to release 1.11.2
      * Fix potential use-after-free in header handling [CVE-2023-49606, boo#1223746]
      * Prevent junk from showing up in error page in invalid requests [CVE-2022-40468, CVE-2023-40533,     boo#1223743]

    - Move tinyproxy program to /usr/bin.

    - Update to release 1.11.1
      * New fnmatch based filtertype

    - Update to release 1.11
      * Support for multiple bind directives.

    - update to 1.10.0:
      * Configuration file has moved from /etc/tinyproxy.conf to         /etc/tinyproxy/tinyproxy.conf.
      * Add support for basic HTTP authentication
      * Add socks upstream support
      * Log to stdout if no logfile is specified
      * Activate reverse proxy by default
      * Support bind with transparent mode
      * Allow multiple listen statements in the configuration
      * Fix CVE-2017-11747: Create PID file before dropping privileges.
      * Fix CVE-2012-3505: algorithmic complexity DoS in hashmap
      * Bugfixes
      * BB#110: fix algorithmic complexity DoS in hashmap
      * BB#106: fix CONNECT requests with IPv6 literal addresses as host
      * BB#116: fix invalid free for GET requests to ipv6 literal address
      * BB#115: Drop supplementary groups
      * BB#109: Fix crash (infinite loop) when writing to log file fails
      * BB#74: Create log and pid files after we drop privs
      * BB#83: Use output of id instead of $USER

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 ESM / 18.04 ESM host has packages installed that are affected by a vulnerability as referenced in the USN-4808-1 advisory.

    It was discovered that Tinyproxy created its pid file with insecure permissions. An attacker could use the     vulnerability to cause arbitrary processes to be killed, resulting in a denial of service.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

A minor security issue and a severe packaging bug have been fixed in tinyproxy, a lightweight http proxy daemon.

CVE-2017-11747

main.c in Tinyproxy created a /var/run/tinyproxy/tinyproxy.pid file after dropping privileges to a non-root account, which might have allowed local users to kill arbitrary processes by leveraging access to this non-root account for tinyproxy.pid modification before a root script executed a 'kill `cat /run/tinyproxy/tinyproxy.pid`' command.

OTHER

Furthermore, a severe flaw had been discovered by Tim Duesterhus in Debian's init script for tinyproxy. With the tiny.conf configuration file having the PidFile option removed, the next run of logrotate (if installed) would have changed the owner of the system's base directory ('/') to tinyproxy:tinyproxy.

For Debian 8 'Jessie', this problem has been fixed in version 1.8.3-3+deb8u1. These fixes were prepared by Mike Gabriel.

We recommend that you upgrade your tinyproxy packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
195342	openSUSE 15 Security Update : tinyproxy (openSUSE-SU-2024:0119-1)	Nessus	SuSE Local Security Checks	high
183157	Ubuntu 16.04 ESM / 18.04 ESM : Tinyproxy vulnerability (USN-4808-1)	Nessus	Ubuntu Local Security Checks	medium
135098	Debian DLA-2163-1 : tinyproxy security update	Nessus	Debian Local Security Checks	medium

Detections

Analytics

CVE-2017-11747

medium

Tenable Plugins

high

medium

medium