Sendmail DNS map TXT record buffer overflow
| sendmail-dns-txt-bo (9443) |  High Risk |
Description:
Sendmail is vulnerable to a buffer overflow in the code that handles DNS responses. By specifying a DNS (Domain Name System) map using a TXT record in a configuration file, a remote attacker can cause an overly long string to be returned from a malicious nameserver, which could overflow a buffer and allow the attacker to execute arbitrary code on the system with root privileges.
*CVSS:
| Base Score: | 10 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | Complete |
| Integrity Impact: | Complete |
| Availability Impact: | Complete |
| Temporal Score: | 7.4 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Access
Remedy:
Upgrade to the latest version of Sendmail (8.12.5 or later), available from the Sendmail Web site. See References.
For Sun Solaris 9:
Apply the appropriate patch for your system (113575-01 or later), as listed in Sun Alert ID: 57696 for more information. See References.
References:
- CIAC Information Bulletin P-059: Sendmail(1) Security Vulnerability.
- Sendmail Consortium Web site: Sendmail 8.12.5.
- Sun Alert ID: 57696: Security Vulnerability When sendmail(1) Does Not Check Length of DNS Replies.
- BID-5122: Sendmail DNS Map TXT Record Buffer Overflow Vulnerability
- CVE-2002-0906: Buffer overflow in Sendmail before 8.12.5, when configured to use a custom DNS map to query TXT records, allows remote attackers to cause a denial of service and possibly execute arbitrary code via a malicious DNS server.
- US-CERT VU#814627: Sendmail vulnerable to buffer overflow when DNS map is specified using TXT records
Platforms Affected:
- Sendmail Sendmail 8.12.0
- Sendmail Sendmail 8.12.1
- Sendmail Sendmail 8.12.2
- Sendmail Sendmail 8.12.3
- Sendmail Sendmail 8.12.4
- Sun Solaris 9
Reported:
Jun 28, 2002
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.