Description (CNA)
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname_to_labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns_server_request_format_response. The final-label check permits j plus label_len plus one to equal buf_len, after which the terminating null byte is written to buf[buf_len]. A crafted DNS server response containing PTR, CNAME, MX, NS, or SOA data can trigger the one-byte out-of-bounds write and crash or corrupt the process. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| libevent / libevent | affected >= 2.2.0-alpha, < 2.2.2-alpha; affected < 2.1.13 |
CWE
CWE-121, CWE-193, CWE-787
References
- https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47
- https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable
- https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha
ADP enrichment
No English description supplied.