CVE-2024-42491

Summary

Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with .1 or [.1], and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting noload = res_resolver_unbound.so in modules.conf, or set rewrite_contact = yes on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.

Affected Software

VendorProductVersion RangeStatus
asteriskasterisk< 18.24.3affected
asteriskasterisk>= 19.0.0, < 20.9.3affected
asteriskasterisk>= 21.0.0, < 21.4.3affected
asteriskasterisk< 18.9-cert12affected
asteriskasterisk>= 19.0, < 20.7-cert2affected

Weaknesses

  • CWE-252: CWE-252: Unchecked Return Value
  • CWE-476: CWE-476: NULL Pointer Dereference

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References