Title: POP3Lite Input Validation Vulnerability
Severity: HIGH
Description:
POP3Lite is a free, open-source compact POP3 daemon for Linux and BSD systems.
POP3Lite has an input validation problem which may be exploited by remote attackers. POP3Lite will not escape leading dots('.') from e-mail it transfers. POP3Lite will send lines with leading dots to the mail client, causing them to be interpreted as an end-of-message. At the very least this may cause unusual behavior to occur, but may be manipulated to malicious effect.
For example, a message may be crafted by the attacker to a victim receiving mail from POP3Lite which causes the victim's client to accept a fake end-of-message followed by falsified arbitrary server responses.
Remote attackers may exploit this issue to inject messages or cause messages to be lost. A potential for mail-spoofing attacks also exists as message headers can be falsified.
A denial of services may also result, depending on how the client interprets the malicious input.
This issue may also be exploited in combination with input validation vulnerabilities that exist in mail clients.
Affected Products:
- Debian Linux 2.2.0 r3 testing
- Debian Linux 2.2.0 r3 unstable
- POP3Lite POP3Lite 0.2.3
- POP3Lite POP3Lite 0.2.3 b
References:
- POP3Lite: POP3Lite Homepage
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