CVE-2018-16657

moderate-risk
Published 2018-09-07

In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with an invalid Via header causes a segmentation fault and crashes Kamailio. The reason is missing input validation in the crcitt_string_array core function for calculating a CRC hash for To tags. (An additional error is present in the check_via_address core function: this function also misses input validation.) This could result in denial of service and potentially the execution of arbitrary code.

Do I need to act?

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0.92% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
+
Fix available
Upgrade to: 743c2d71beda536be3dd3b07b0f9b1d4b7e42743, b7547543f64511ca7103f21e24c839127b01a3f4
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (3)

Kamailio

Affected Vendors

Debian Kamailio

References (6)

Mailing List https://lists.debian.org/debian-lts-announce/2018/09/msg00013.html
Exploit https://skalatan.de/blog/advisory-hw-2018-06
Third Party Advisory https://www.debian.org/security/2018/dsa-4292
Mailing List https://lists.debian.org/debian-lts-announce/2018/09/msg00013.html
Exploit https://skalatan.de/blog/advisory-hw-2018-06
Third Party Advisory https://www.debian.org/security/2018/dsa-4292
44
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 3/34 · Minimal
Exposure 9/34 · Low