Signature Detail
Short Name |
SMTP:EMAIL:RCPT-TO-DECODE |
|---|---|
Severity |
High |
Recommended |
No |
Recommended Action |
Drop |
Category |
SMTP |
Keywords |
RCPT TO "decode" |
Release Date |
2003/04/22 |
Update Number |
1213 |
Supported Platforms |
di-5.3+, idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
SMTP: RCPT TO "decode"
This signature detects attempts to send shell commands through an SMTP e-mail message by exploiting the "decode" e-mail alias vulnerability. Attackers can use the invalid "rcpt to decode" as the "rcpt to" e-mail address to cause Sendmail to reroute data to the program uudecode. Attackers can then send uuencoded data to overwrite files or place an arbitrary .rhosts files onto the system.
Extended Description
A vulnerability in Eric Allman's Sendmail prior to version 8.6.10 (and any versions based on 5.x) can be exploited to gain root access on the affected machine. This vulnerability involves sending invalid "mail from" and "rcpt to" addresses that cause sendmail to inappropriately redirect data to another program.
Affected Products
- Eric Allman Sendmail 5.58.0
- Eric Allman Sendmail 5.59.0
References