CVE-2021-37706
Description
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.
How to fix
- asterisk certified_asterisk16.8.0 or later
- sangoma asterisk16.24.1, 18.10.1, 19.2.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| teluu pjsip | v ≤ 2.11.1 | — |
| asterisk certified_asterisk | v < 16.8.0, 16.8.0 | 16.8.0 |
| sangoma asterisk | 16.0.0 ≤ v < 16.24.1, 18.0.0 ≤ v < 18.10.1, 19.0.0 ≤ v < 19.2.1 | 16.24.1, 18.10.1, 19.2.1 |
| debian debian_linux | 9.0, 10.0 | — |
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Attack Surface Management
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