fixproc in Net-snmp 5.x before 5.2.1-r1 creates temporary files insecurely, which allows local users to modify the contents of those files to execute arbitrary commands, or overwrite arbitrary files via a symlink attack.

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.

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.

The remote Redhat Enterprise Linux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2005:395 advisory.

  - security flaw (CVE-2005-1740, CVE-2005-2177, CVE-2005-4837)

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

A Gentoo advisory reports :

Net-SNMP creates temporary files in an insecure manner, possibly allowing the execution of arbitrary code.

A malicious local attacker could exploit a race condition to change the content of the temporary files before they are executed by fixproc, possibly leading to the execution of arbitrary code. A local attacker could also create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When fixproc is executed, this would result in the file being overwritten.

The remote host is affected by the vulnerability described in GLSA-200505-18 (Net-SNMP: fixproc insecure temporary file creation)

    The fixproc application of Net-SNMP creates temporary files with     predictable filenames.
  Impact :

    A malicious local attacker could exploit a race condition to change the     content of the temporary files before they are executed by fixproc,     possibly leading to the execution of arbitrary code. A local attacker     could also create symbolic links in the temporary files directory,     pointing to a valid file somewhere on the filesystem. When fixproc is     executed, this would result in the file being overwritten.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Severity
67027	CentOS 4 : net-snmp (CESA-2005:395)	Nessus	CentOS Local Security Checks	critical
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
19988	RHEL 4 : net-snmp (RHSA-2005:395)	Nessus	Red Hat Local Security Checks	high
19829	RHEL 3 : net-snmp (RHSA-2005:373)	Nessus	Red Hat Local Security Checks	critical
18909	FreeBSD : net-snmp -- fixproc insecure temporary file creation (3e0072d4-d05b-11d9-9aed-000e0c2e438a)	Nessus	FreeBSD Local Security Checks	critical
18382	GLSA-200505-18 : Net-SNMP: fixproc insecure temporary file creation	Nessus	Gentoo Local Security Checks	critical

Detections

Analytics

CVE-2005-1740

high

Tenable Plugins

critical

critical

critical

high

critical

critical

critical