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Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process. PJSIP is a free and open source multimedia communication library written in C. Prior to commit 8d5956a, a heap buffer overflow exists in the PJLIB-UTIL HTTP client (http_client.c) when buffering an HTTP response body. This affects applications that use the PJLIB-UTIL HTTP client to receive a whole response body at once (a completion callback with no incremental on_data_read callback). When growing the response buffer, an incorrect size calculation based on the server-supplied Content-Length can leave the buffer too small, causing response data to be written past the end of the allocation. A malicious or man-in-the-middle HTTP server can trigger this with a crafted response; impact may range from unexpected application termination to memory corruption. Applications that consume the response incrementally (via on_data_read), or that only connect to trusted servers, are not affected. This issue has been patched via commit 8d5956a.
Not applicable to Asterisk. This is a heap buffer overflow in the PJLIB-UTIL HTTP client, http_client.c, when buffering a whole HTTP response body. The upstream advisory states it affects applications that use that client to receive a complete response body at once, via a completion callback with no incremental on_data_read callback. Asterisk does not use PJLIB-UTIL's HTTP client. There are no references to it anywhere in the Asterisk source tree; Asterisk has its own HTTP implementation. Fixed upstream in pjproject commit 8d5956a. Same determination as the Fedora tracker, bug 2531096.
Closing as NOTABUG per the analysis above — the flaw is in PJLIB-UTIL's HTTP client, which Asterisk does not use. As with the other pjproject CVEs in this batch, this is a reachability determination rather than the code being absent: http_client.c is still compiled into the bundled library.