CVE-2009-2726
HighSummary
Sterownik kanału SIP w Asterisk Open Source w wersjach 1.2.x przed 1.2.34, 1.4.x przed 1.4.26.1, 1.6.0.x przed 1.6.0.12 oraz 1.6.1.x przed 1.6.1.4, a także w Asterisk Business Edition i Asterisk Appliance s800i, nie stosuje maksymalnej szerokości przy wywoływaniu funkcji typu sscanf. To umożliwia zdalnym atakującym wywołanie odmowy usługi (zużycie pamięci stosu) poprzez pakiety SIP zawierające duże sekwencje znaków dziesiętnych ASCII.
Risk Assessment
Organizacja może być narażona na ataki, które prowadzą do odmowy usługi, co może skutkować przestojem w działaniu systemu komunikacyjnego. W rezultacie może to wpłynąć na dostępność usług i zaufanie użytkowników.
Recommendation
Zaleca się aktualizację Asteriska do najnowszej wersji, aby usunąć tę podatność. Dodatkowo warto monitorować ruch SIP w celu wykrywania potencjalnych prób ataków.
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Original NVD description (English source)
The SIP channel driver in Asterisk Open Source 1.2.x before 1.2.34, 1.4.x before 1.4.26.1, 1.6.0.x before 1.6.0.12, and 1.6.1.x before 1.6.1.4; Asterisk Business Edition A.x.x, B.x.x before B.2.5.9, C.2.x before C.2.4.1, and C.3.x before C.3.1; and Asterisk Appliance s800i 1.2.x before 1.3.0.3 does not use a maximum width when invoking sscanf style functions, which allows remote attackers to cause a denial of service (stack memory consumption) via SIP packets containing large sequences of ASCII decimal characters, as demonstrated via vectors related to (1) the CSeq value in a SIP header, (2) large Content-Length value, and (3) SDP.

