CVE-2018-12584: The ConnectionBase::preparseNewBytes function in resip/stack/ConnectionBase.cxx in reSIProcate through 1.10.2 allows remote attackers to cause a denial of…

PriorityP268critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EXPLOIT

EPSS

24.59%

97.6th percentile

The ConnectionBase::preparseNewBytes function in resip/stack/ConnectionBase.cxx in reSIProcate through 1.10.2 allows remote attackers to cause a denial of service (buffer overflow) or possibly execute arbitrary code when TLS communication is enabled.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	debian_linux	—	—
resiprocate	resiprocate	<= 1.10.2	—

Detection & IOCsextracted from sources · hover to see the quote

pathresip/stack/ConnectionBase.cxx↗

port5061↗

commandREGISTER sip:<server> SIP/2.0\r\nVia: SIP/2.0/TCP <via>\r\nContact: \r\nTo: \r\nFrom: \r\nCSeq: <n> REGISTER\r\nExpires: 600\r\nContent-Length: 100\r\n\r\n↗

commandSIP/2.0 200 OK with Content-Length: 100 followed by oversized body (100*'A' + 64*'B')↗

→Trigger condition: TLS SIP message (REGISTER or response) sent with a Content-Length value lower than the actual body length that follows in a subsequent TLS packet. Detect anomalous Content-Length vs. actual body size mismatch on TLS port 5061. ↗
→The vulnerability is only exploitable over TLS (port 5061); TCP transport does not trigger the overflow. Focus TLS SIP inspection on ConnectionBase::preparseNewBytes call path. ↗
→No SIP authentication is required to trigger the vulnerability; unauthenticated REGISTER or SUBSCRIBE requests over TLS to port 5061 with mismatched Content-Length should be flagged. ↗
→Client-side exploitation vector: a malicious SIP server can trigger the overflow in reSIProcate-based clients by responding to a SUBSCRIBE request with a 200 OK containing a Content-Length smaller than the body sent. ↗

·The heap overflow is only reachable when TLS is enabled in reSIProcate. Deployments using TCP-only transport are not affected. ↗
·Affected versions are reSIProcate through 1.10.2. The fix is in commit 2cb291191c93c7c4e371e22cb89805a5b31d6608; 3CX Phone System 15.5.13470.6+ and Debian package 1:1.9.7-5+deb8u1 include the fix. ↗

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P

osv9.8CRITICAL

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