Certain contributed scripts for ekg Gadu Gadu client 1.5 and earlier create temporary files insecurely, with unknown impact and attack vectors, a different vulnerability than CVE-2005-1916.

This advisory adds security support for the stable amd64 distribution.
It covers all security updates since the release of sarge, which were missing updated packages for the not yet official amd64 port. Future security advisories will include updates for this port as well.

Wojtek Kaniewski reports :

Multiple vulnerabilities have been found in libgadu, a library for handling Gadu-Gadu instant messaging protocol. It is a part of ekg, a Gadu-Gadu client, but is widely used in other clients. Also some of the user contributed scripts were found to behave in an insecure manner.

- integer overflow in libgadu (CVE-2005-1852) that could be triggered by an incomming message and lead to application crash and/or remote code execution

- insecure file creation (CVE-2005-1850) and shell command injection (CVE-2005-1851) in other user contributed scripts (discovered by Marcin Owsiany and Wojtek Kaniewski)

- several signedness errors in libgadu that could be triggered by an incomming network data or an application passing invalid user input to the library

- memory alignment errors in libgadu that could be triggered by an incomming message and lead to bus errors on architectures like SPARC

- endianness errors in libgadu that could cause invalid behaviour of applications on big-endian architectures

Marcin Owsiany and Wojtek Kaniewski discovered that some contributed scripts (contrib/ekgh, contrib/ekgnv.sh, and contrib/getekg.sh) in the ekg package created temporary files in an insecure way, which allowed exploitation of a race condition to create or overwrite files with the privileges of the user invoking the script. (CAN-2005-1850)

Marcin Owsiany and Wojtek Kaniewski discovered a shell command injection vulnerability in a contributed utility (contrib/scripts/ekgbot-pre1.py). By sending specially crafted content to the bot, an attacker could exploit this to execute arbitrary code with the privileges of the user running ekgbot. (CAN-2005-1851)

Marcin Slusarz discovered an integer overflow in the Gadu library. By sending a specially crafted incoming message, a remote attacker could execute arbitrary code with the privileges of the application using libgadu. (CAN-2005-1852)

Eric Romang discovered that another contributed script (contrib/scripts/linki.py) created temporary files in an insecure way, which allowed exploitation of a race condition to create or overwrite files with the privileges of the user invoking the script.
(CAN-2005-1916)

Grzegorz Jaskiewicz discovered several integer overflows in the Gadu library. A remote attacker could exploit this to crash the Gadu client application or even execute arbitrary code with the privileges of the user by sending specially crafted messages. (CAN-2005-2369)

Szymon Zygmunt and Michal Bartoszkiewicz discovered a memory alignment error in the Gadu library. By sending specially crafted messages, a remote attacker could crash the application using the library. (CAN-2005-2370)

Marcin Slusarz discovered that the Gadu library did not properly handle endianess conversion in some cases. This caused invalid behavior on big endian architectures. The only affected supported architecture is powerpc. (CAN-2005-2448).

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

Several vulnerabilities have been discovered in ekg, a console Gadu Gadu client, an instant messaging program. The Common Vulnerabilities and Exposures project identifies the following vulnerabilities :

  - CAN-2005-1850     Marcin Owsiany and Wojtek Kaniewski discovered insecure     temporary file creation in contributed scripts.

  - CAN-2005-1851

    Marcin Owsiany and Wojtek Kaniewski discovered potential     shell command injection in a contributed script.

  - CAN-2005-1916

    Eric Romang discovered insecure temporary file creation     and arbitrary command execution in a contributed script     that can be exploited by a local attacker.

ID	Name	Product	Family	Severity
57528	Debian DSA-773-1 : amd64 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
21414	FreeBSD : libgadu -- multiple vulnerabilities (3b4a6982-0b24-11da-bc08-0001020eed82)	Nessus	FreeBSD Local Security Checks	critical
20568	Ubuntu 5.04 : ekg vulnerabilities (USN-162-1)	Nessus	Ubuntu Local Security Checks	critical
19223	Debian DSA-760-1 : ekg - several vulnerabilities	Nessus	Debian Local Security Checks	critical

Detections

Analytics

CVE-2005-1850

critical

Tenable Plugins

critical

critical

critical

critical