Vulnerability in CESNET libyang

[ Description ]Official description

libyang through 6.4.13 contains an uninitialized pointer free vulnerability in lydxml_env_netconf_rpc() in src/parser_xml.c when parsing NETCONF rpc action envelopes. Peers with a NETCONF session can send an action element containing non-whitespace text via lyd_parse_op() to crash servers like netopeer2 or corrupt the heap.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/CESNET/libyang
• github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c
• github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c
• github.com/CESNET/libyang/commit/927fce908774289a7d9c07fff5704c33965c9773
• github.com/CESNET/libyang/issues/2595
• hackmd.io/@haindpwn/libyang-netconf-rpc-envelope-uninit-free
• www.vulncheck.com/advisories/libyang-through-6.4.13-uninitialized-pointer-free-in-netco…