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Integer Underflow The advisory has been revoked - it doesn't affect any version of package asterisk  (opens in a new tab)

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EPSS
3.29% (92nd percentile)

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  • Snyk IDSNYK-DEBIAN9-ASTERISK-2405738
  • published23 Dec 2021
  • disclosed22 Dec 2021
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Introduced: 22 Dec 2021

CVE-2021-37706  (opens in a new tab)
CWE-191  (opens in a new tab)

Amendment

The Debian security team deemed this advisory irrelevant for Debian:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream asterisk package and not the asterisk package as distributed by Debian.

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.