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Yate SIP Denial of Service Vulnerability
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SUMMARY
<http://yate.null.ro/> Yate (Yet Another Telephony Engine) is "a
production-ready next-generation telephony engine". The SIP channel module
of Yate contains a denial of service vulnerability, introduced by a null
pointer dereference, which could be provoked by having the SIP module
process SIP messages containing the "Call-Info" header, without the
"purpose" parameter as part of its value.
DETAILS
Vulnerable Systems:
* Yate version 1.1.0
Immune Systems:
* Yate version 1.2.0
The flaw can be seen in the following source code snippet:
File: yate/modules/ysipchan.cpp
Lines: 1585 - 1594
1: const SIPHeaderLine* hl =
m_tr->initialMessage()->getHeader("Call-Info");
2: if (hl) {
3: const NamedString* type = hl->getParam("purpose");
4: if (!type || *type == "info")
5: mp type->addParam("caller_info_uri",*type);
6: else if (*type == "icon")
7: m->addParam("caller_icon_uri",*type);
8: else if (*type == "card")
9: m->addParam("caller_card_uri",*type);
10: }
Once the "Call-Info" header is found in the SIP message (line 1), there is
an attempt to extract the "purpose" parameter (line 3). Afterwards, a
decision is made to set the "caller_info_uri" parameter (line 5) to the
value of the "Call-Info" header, though due to a programming error,
instead of assigning the parameter with the header value, it is being
assigned with the value of the "purpose" parameter - allowing for a null
pointer dereference, when the call to getParam() (line 3) returns 0 in
case of a missing "purpose" parameter.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1693>
CVE-2007-1693
ADDITIONAL INFORMATION
The information has been provided by <mailto:YuriG@radware.com> Yuri
Gushin.
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