#VU110625 Input validation error in Postfix - CVE-2003-0540
Vulnerability identifier: #VU110625
Vulnerability risk: Medium
CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: Yes
Vulnerable software:
Postfix
Server applications /
Mail servers
Vendor: Postfix.org
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack via (1) a malformed envelope address to a local host that would generate a bounce and contains the ".!" string in the MAIL FROM or Errors-To headers, which causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO containing a ".!" string, which causes an instance of the SMTP listener to lock up.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Postfix: 1.0.21, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.1.5, 1.1.6, 1.1.7, 1.1.8, 1.1.9, 1.1.10, 1.1.11, 1.1.12
External links
https://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000717
https://lists.grok.org.uk/pipermail/full-disclosure/2003-August/007693.html
https://marc.info/?l=bugtraq&m=106001525130257&w=2
https://marc.info/?l=bugtraq&m=106029188614704&w=2
https://secunia.com/advisories/9433
https://www.debian.org/security/2003/dsa-363
https://www.kb.cert.org/vuls/id/895508
https://www.linuxsecurity.com/advisories/engarde_advisory-3517.html
https://www.mandriva.com/security/advisories?name=MDKSA-2003:081
https://www.novell.com/linux/security/advisories/2003_033_postfix.html
https://www.redhat.com/support/errata/RHSA-2003-251.html
https://www.securityfocus.com/bid/8333
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A544
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
