Off-by-one error in the channel code of OpenSSH 2.0 through 3.0.2 allows local users or remote malicious servers to gain privileges.

The version of SunSSH running on the remote host has an information disclosure vulnerability.  A design flaw in the SSH specification could allow a man-in-the-middle attacker to recover up to 32 bits of plaintext from an SSH-protected connection in the standard configuration.  An attacker could exploit this to gain access to sensitive information.

Note that this version of SunSSH is also prone to several additional issues but Nessus did not test for them.

Joost Pol reports that OpenSSH versions 2.0 through 3.0.2 have an off-by-one bug in the channel allocation code.  This vulnerability can be exploited by authenticated users to gain root privilege or by a malicious server exploiting a client with this bug.

The remote host is running a version of OpenSSH which is older than 3.1. Versions prior than 3.1 are vulnerable to an off by one error that allows local users to gain root access, and it may be possible for remote users to similarly compromise the daemon for remote access. In addition, a vulnerable SSH client may be compromised by connecting to a malicious SSH daemon that exploits this vulnerability in the client code, thus compromising the client system.

Note: NNM has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner. 

The remote host is running a version of OpenSSH older than OpenSSH 3.2.1. A buffer overflow exists in the daemon if AFS is enabled on your system, or if the options KerberosTgtPassing or AFSTokenPassing are enabled.  Even in this scenario, the vulnerability may be avoided by enabling UsePrivilegeSeparation. Versions prior to 2.9.9 are vulnerable to a remote root exploit. Versions prior to 3.2.1 are vulnerable to a local root exploit.

Note: NNM has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner. 

The remote host is running a version of OpenSSH that is older than 3.0.1. Versions older than 3.0.1 are vulnerable to a flaw in which an attacker may authenticate, provided that Kerberos V support has been enabled (which is not the case by default).  It is also vulnerable to an excessive memory clearing bug, believed to be unexploitable.

Note: NNM has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner.

*** You may ignore this warning if this host is not using Kerberos V 

Joost Pol found a bug in the channel code of all versions of OpenSSH from 2.0 to 3.0.2. This bug can allow authenticated users with an existing account on the vulnerable system to obtain root privilege or by a malicious server attacking a vulnerable client. OpenSSH 3.1 is not vulnerable to this problem. The provided packages fix this vulnerability.

You are running a version of OpenSSH which is older than 3.1.

Versions prior than 3.1 are vulnerable to an off by one error that allows local users to gain root access, and it may be possible for remote users to similarly compromise the daemon for remote access.

In addition, a vulnerable SSH client may be compromised by connecting to a malicious SSH daemon that exploits this vulnerability in the client code, thus compromising the client system.

ID	Name	Product	Family	Severity
55992	SunSSH < 1.1.1 / 1.3 CBC Plaintext Disclosure	Nessus	Misc.	critical
14956	Debian DSA-119-1 : ssh -- local root exploit, remote client exploit	Nessus	Debian Local Security Checks	critical
1990	OpenSSH < 3.1 Channel Code Off by One Privilege Escalation	Nessus Network Monitor	SSH	high
1989	OpenSSH < 3.2.1 AFS/Kerberos Ticket/Token Passing Overflow	Nessus Network Monitor	SSH	high
1986	OpenSSH < 3.0.1 Multiple Vulnerabilities	Nessus Network Monitor	SSH	high
13927	Mandrake Linux Security Advisory : openssh (MDKSA-2002:019)	Nessus	Mandriva Local Security Checks	critical
10883	OpenSSH < 3.1 Channel Code Off by One Remote Privilege Escalation	Nessus	Gain a shell remotely	critical

Detections

Analytics

CVE-2002-0083

critical

Tenable Plugins

critical

critical

high

high

high

critical

critical