Title: ProFTPD Client Hostname Resolving Vulnerability
Severity: MODERATE
Description:
ProFTPD is a popular FTP server that ships with numerous Unix and Linux variants.
ProFTPD contains a vulnerability that may allow for remote attackers to bypass ProFTPD access control lists (ACLs) or have false information logged.
When 'UseReverseDNS' mode is set in the configuration file, ProFTPD will attempt to 'reverse resolve' the hostnames of clients connecting. The resolved hostname will then be evaluated against the ACLs and recorded as the client address in the logs. Unfortunately, ProFTPD does not forward resolve the hostname to verify that one of the IP addresses listed in DNS records matches that of the connected client.
It may be possible for a remote attacker with control over address space to set an arbitrary hostname as the PTR record for the attacking address. When the attacker connects, ProFTPD will resolve the attacker-specified hostname and will evaluate it against it's hostname-based ACLs. If the attacker is aware of permitted hostnames, it may be possible to bypass ACL restrictions and login by exploiting this vulnerability. The ProFTPD logs will also record the reverse-resolved hostname.
Affected Products:
- Cobalt Qube 2.0.0
- Cobalt Qube 3.0.0
- Cobalt RaQ 1.1.0
- Cobalt RaQ 2.0.0
- Cobalt RaQ 3.0.0
- Conectiva Linux 5.0.0
- Conectiva Linux 5.1.0
- Conectiva Linux 6.0.0
- Conectiva Linux 7.0.0
- Conectiva Linux ecommerce
- Conectiva Linux graficas
- MandrakeSoft Linux Mandrake 7.2.0
- MandrakeSoft Linux Mandrake 8.0.0
- MandrakeSoft Linux Mandrake 8.0.0 ppc
- MandrakeSoft Linux Mandrake 8.1.0
- MandrakeSoft Linux Mandrake 8.1.0 ia64
- ProFTPD Project ProFTPD 1.2.0
- ProFTPD Project ProFTPD 1.2.0.0rc3
- ProFTPD Project ProFTPD 1.2.0pre1
- ProFTPD Project ProFTPD 1.2.0pre10
- ProFTPD Project ProFTPD 1.2.0pre11
- ProFTPD Project ProFTPD 1.2.0pre2
- ProFTPD Project ProFTPD 1.2.0pre3
- ProFTPD Project ProFTPD 1.2.0pre4
- ProFTPD Project ProFTPD 1.2.0pre5
- ProFTPD Project ProFTPD 1.2.0pre6
- ProFTPD Project ProFTPD 1.2.0pre7
- ProFTPD Project ProFTPD 1.2.0pre8
- ProFTPD Project ProFTPD 1.2.0pre9
- ProFTPD Project ProFTPD 1.2.1
- ProFTPD Project ProFTPD 1.2.2
- ProFTPD Project ProFTPD 1.2.2rc1
- ProFTPD Project ProFTPD 1.2.2rc3
References:
- Conectiva: CLSA-2002:450 proftpd
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