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Files from Qualys Security Advisory

Email addressqsa at
First Active2015-01-27
Last Active2018-05-13
Libuser roothelper Privilege Escalation
Posted May 13, 2018
Authored by Brendan Coles, Qualys Security Advisory | Site

This Metasploit module attempts to gain root privileges on Red Hat based Linux systems, including RHEL, Fedora and CentOS, by exploiting a newline injection vulnerability in libuser and userhelper versions prior to 0.56.13-8 and version 0.60 before 0.60-7. This Metasploit module makes use of the roothelper.c exploit from Qualys to insert a new user with UID=0 in /etc/passwd. Note, the password for the current user is required by userhelper. Note, on some systems, such as Fedora 11, the user entry for the current user in /etc/passwd will become corrupted and exploitation will fail. This Metasploit module has been tested successfully on libuser packaged versions 0.56.13-4.el6 on CentOS 6.0 (x86_64); 0.56.13-5.el6 on CentOS 6.5 (x86_64); 0.60-5.el7 on CentOS 7.1-1503 (x86_64); 0.56.16-1.fc13 on Fedora 13 (i686); 0.59-1.fc19 on Fedora Desktop 19 (x86_64); 0.60-3.fc20 on Fedora Desktop 20 (x86_64); 0.60-6.fc21 on Fedora Desktop 21 (x86_64); 0.60-6.fc22 on Fedora Desktop 22 (x86_64); 0.56.13-5.el6 on Red Hat 6.6 (x86_64); and 0.60-5.el7 on Red Hat 7.0 (x86_64). RHEL 5 is vulnerable, however the installed version of glibc (2.5) is missing various functions required by roothelper.c.

tags | exploit, root
systems | linux, redhat, fedora, centos
advisories | CVE-2015-3245, CVE-2015-3246
MD5 | 29f14e9f5067bd0c43af11f1008beb02
Qualys Security Advisory - GNU C Library Memory Leak / Buffer Overflow
Posted Dec 13, 2017
Authored by Qualys Security Advisory

Qualys has discovered a memory leak and a buffer overflow in the dynamic loader ( of the GNU C Library (glibc).

tags | exploit, overflow, memory leak
advisories | CVE-2017-1000408, CVE-2017-1000409
MD5 | 627d9c13d012677a6feb6b4514cbb8e3
Linux Local Privilege Escalation
Posted Sep 28, 2017
Authored by Qualys Security Advisory

A Linux PIE/stack corruption vulnerability exists. Most notably, all versions of CentOS 7 before 1708 (released on September 13, 2017), all versions of Red Hat Enterprise Linux 7 before 7.4 (released on August 1, 2017), and all versions of CentOS 6 and Red Hat Enterprise Linux 6 are exploitable.

tags | advisory
systems | linux, redhat, centos
advisories | CVE-2017-1000253
MD5 | b53db8644bb756103fde5373b019b1c1
Qualys Security Advisory - OpenSSH Overflow / Leak
Posted Jan 15, 2016
Authored by Qualys Security Advisory

Since version 5.4 (released on March 8, 2010), the OpenSSH client supports an undocumented feature called roaming: if the connection to an SSH server breaks unexpectedly, and if the server supports roaming as well, the client is able to reconnect to the server and resume the suspended SSH session. Although roaming is not supported by the OpenSSH server, it is enabled by default in the OpenSSH client, and contains two vulnerabilities that can be exploited by a malicious SSH server (or a trusted but compromised server): an information leak (memory disclosure), and a buffer overflow (heap-based).

tags | advisory, overflow, vulnerability
advisories | CVE-2016-0777, CVE-2016-0778
MD5 | 2360520b5690a162d17aeb52bbfce9f6
Qualys Security Advisory - LibreSSL Leak / Overflow
Posted Oct 18, 2015
Authored by Qualys Security Advisory

Qualys discovered various vulnerabilities in LibreSSL. These include a memory leak and a buffer overflow.

tags | advisory, overflow, vulnerability, memory leak
advisories | CVE-2015-5333, CVE-2015-5334
MD5 | a09c98183d166108c5dbf9105951954a
Qualys Security Advisory - OpenSMTPD Audit Report
Posted Oct 4, 2015
Authored by Qualys Security Advisory

Qualys discovered various vulnerabilities in OpenSMTPD. These include, but are not limited to, denial of service, buffer overflow, hardlink attack and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, vulnerability
MD5 | 20c4ffd499c1a6466cfce72f6b1c0a80
Qualys Security Advisory - userhelper / libuser
Posted Jul 23, 2015
Authored by Qualys Security Advisory

The libuser library implements a standardized interface for manipulating and administering user and group accounts, and is installed by default on Linux distributions derived from Red Hat's codebase. During an internal code audit at Qualys, they discovered multiple libuser-related vulnerabilities that allow local users to perform denial-of-service and privilege-escalation attacks. As a proof of concept, they developed an unusual local root exploit against one of libuser's applications. Both the advisory and exploit are included in this post.

tags | exploit, local, root, vulnerability, proof of concept
systems | linux, redhat
advisories | CVE-2015-3245, CVE-2015-3246
MD5 | d10eb7969178d2c38456f40ec558206a
Exim GHOST (glibc gethostbyname) Buffer Overflow
Posted Mar 24, 2015
Authored by Qualys Security Advisory | Site

This Metasploit module remotely exploits CVE-2015-0235 (a.k.a. GHOST, a heap-based buffer overflow in the GNU C Library's gethostbyname functions) on x86 and x86_64 GNU/Linux systems that run the Exim mail server.

tags | exploit, overflow, x86
systems | linux
advisories | CVE-2015-0235
MD5 | f9b4c0641a27ad6ce3191c2c2e8599fe
Qualys Security Advisory - glibc gethostbyname Buffer Overflow
Posted Jan 27, 2015
Authored by Alexander Peslyak, Qualys Security Advisory

Qualys Security Advisory - During a code audit performed internally at Qualys, they discovered a buffer overflow in the __nss_hostname_digits_dots() function of the GNU C Library (glibc). This bug is reachable both locally and remotely via the gethostbyname*() functions, so they decided to analyze it -- and its impact -- thoroughly, and named this vulnerability "GHOST".

tags | exploit, overflow
advisories | CVE-2015-0235
MD5 | 224667245d80596a539da4cf2a8490ef
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