Net-SNMP 5.0.x before 5.0.10.2, 5.2.x before 5.2.1.2, and 5.1.3, when net-snmp is using stream sockets such as TCP, allows remote attackers to cause a denial of service (daemon hang and CPU consumption) via a TCP packet of length 1, which triggers an infinite loop.

SunOS 5.10: SMA patch.
Date this patch was last updated by Sun : Jun/30/11

Updated net-snmp packages that fix two security issues and various bugs are now available.

This update has been rated as having low security impact by the Red Hat Security Response Team.

SNMP (Simple Network Management Protocol) is a protocol used for network management.

A denial of service bug was found in the way net-snmp uses network stream protocols. It is possible for a remote attacker to send a net-snmp agent a specially crafted packet that will crash the agent.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2005-2177 to this issue.

An insecure temporary file usage bug was found in net-snmp's fixproc command. It is possible for a local user to modify the content of temporary files used by fixproc that can lead to arbitrary command execution. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2005-1740 to this issue.

Additionally, the following bugs have been fixed: - The lmSensors are correctly recognized, snmp deamon no longer segfaults - The larger swap partition sizes are correctly reported - Querying hrSWInstalledLastUpdateTime no longer crashes the snmp deamon - Fixed error building ASN.1 representation - The 64-bit network counters correctly wrap - Large file systems are correctly handled - Snmptrapd initscript correctly reads options from its configuration file /etc/snmp/snmptrapd.options - Snmp deamon no longer crashes when restarted using the agentX protocol - snmp daemon now reports gigabit Ethernet speeds correctly - MAC adresses are shown when requested instead of IP adresses

All users of net-snmp should upgrade to these updated packages, which resolve these issues.

A security vulnerability has been found in Net-SNMP releases that could allow a denial of service attack against Net-SNMP agents that have opened a stream based protocol (e.g. TCP but not UDP). By default, Net-SNMP does not open a TCP port.

Updated net-snmp packages that fix two security issues and various bugs are now available.

This update has been rated as having low security impact by the Red Hat Security Response Team.

SNMP (Simple Network Management Protocol) is a protocol used for network management.

A denial of service bug was found in the way net-snmp uses network stream protocols. It is possible for a remote attacker to send a net-snmp agent a specially crafted packet which will crash the agent.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2005-2177 to this issue.

An insecure temporary file usage bug was found in net-snmp's fixproc command. It is possible for a local user to modify the content of temporary files used by fixproc which can lead to arbitrary command execution. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2005-1740 to this issue.

Additionally the following bugs have been fixed: - snmpwalk no longer hangs when a non-existent pid is listed. - snmpd no longer segfaults due to incorrect handling of lmSensors. - an incorrect assignment leading to invalid values in ASN mibs has been fixed. - on systems running a 64-bit kernel, the values in /proc/net/dev no longer become too large to fit in a 32-bit object. - the net-snmp-devel packages correctly depend on elfutils-libelf-devel. - large file systems are correctly handled - snmp daemon now reports gigabit Ethernet speeds correctly - fixed consistency between IP adresses and hostnames in configuration file

All users of net-snmp should upgrade to these updated packages, which resolve these issues.

The fixproc application in Net-SNMP creates temporary files with predictable file names which could allow a malicious local attacker to change the contents of the temporary file by exploiting a race condition, which could possibly lead to the execution of arbitrary code. As well, a local attacker could create symbolic links in the /tmp directory that point to a valid file that would then be overwritten when fixproc is executed (CVE-2005-1740).

A remote Denial of Service vulnerability was also discovered in the SNMP library that could be exploited by a malicious SNMP server to crash the agent, if the agent uses TCP sockets for communication (CVE-2005-2177).

The updated packages have been patched to correct these problems.

USN-190-1 fixed a vulnerability in the net-snmp library. It was discovered that the same problem also affects the ucs-snmp implementation (which is used by the Cyrus email server).

Original advisory :

A remote Denial of Service has been discovered in the SMNP (Simple Network Management Protocol) library. If a SNMP agent uses TCP sockets for communication, a malicious SNMP server could exploit this to crash the agent. Please note that by default SNMP uses UDP sockets.

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.

A remote Denial of Service has been discovered in the SMNP (Simple Network Management Protocol) library. If a SNMP agent uses TCP sockets for communication, a malicious SNMP server could exploit this to crash the agent. Please note that by default SNMP uses UDP sockets.

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.

A Denial of Service vulnerability was discovered in the way that ucd-snmp uses network stream protocols. A remote attacker could send a ucd-snmp agent a specially crafted packet that would cause the agent to crash.

The updated packages have been patched to correct this problem.

Updated ucd-snmp packages that a security issue are now available for Red Hat Enterprise Linux 2.1.

This update has been rated as having low security impact by the Red Hat Security Response Team.

SNMP (Simple Network Management Protocol) is a protocol used for network management.

A denial of service bug was found in the way ucd-snmp uses network stream protocols. A remote attacker could send a ucd-snmp agent a specially crafted packet which will cause the agent to crash. The Common Vulnerabilities and Exposures project assigned the name CVE-2005-2177 to this issue.

All users of ucd-snmp should upgrade to these updated packages, which contain a backported patch to resolve this issue.

A Net-SNMP release announcement reports :

A security vulnerability has been found in Net-SNMP releases that could allow a denial of service attack against Net-SNMP agent's which have opened a stream based protocol (EG, TCP but not UDP; it should be noted that Net-SNMP does not by default open a TCP port).

ID	Name	Product	Family	Severity
107359	Solaris 10 (sparc) : 120272-31	Nessus	Solaris Local Security Checks	critical
67027	CentOS 4 : net-snmp (CESA-2005:395)	Nessus	CentOS Local Security Checks	critical
22739	Debian DSA-873-1 : net-snmp - programming error	Nessus	Debian Local Security Checks	medium
21812	CentOS 3 : net-snmp (CESA-2005:373)	Nessus	CentOS Local Security Checks	critical
20819	Mandrake Linux Security Advisory : net-snmp (MDKSA-2006:025)	Nessus	Mandriva Local Security Checks	critical
20604	Ubuntu 4.10 / 5.04 / 5.10 : ucd-snmp vulnerability (USN-190-2)	Nessus	Ubuntu Local Security Checks	medium
20603	Ubuntu 4.10 / 5.04 : net-snmp vulnerability (USN-190-1)	Nessus	Ubuntu Local Security Checks	medium
19988	RHEL 4 : net-snmp (RHSA-2005:395)	Nessus	Red Hat Local Security Checks	critical
19894	Mandrake Linux Security Advisory : ucd-snmp (MDKSA-2005:137)	Nessus	Mandriva Local Security Checks	medium
19829	RHEL 3 : net-snmp (RHSA-2005:373)	Nessus	Red Hat Local Security Checks	critical
19413	RHEL 2.1 : ucd-snmp (RHSA-2005:720)	Nessus	Red Hat Local Security Checks	medium
19085	FreeBSD : net-snmp -- remote DoS vulnerability (b2a1a3b5-ed95-11d9-8310-0001020eed82)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2005-2177

high

Tenable Plugins

critical

critical

medium

critical

critical

medium

medium

critical

medium

critical

medium

medium