openvpn: Update to version 2.7.7

- Update from version 2.7.6 to 2.7.7
- No change in rootfile
- 10 CVE fixes
- Changelog
2.7.7
Security fixes
    reliability layer: Avoid unbounded reliable TLS timeout (CVE-2026-84732)
    reliability layer: Ignore acks for packets that cannot be outstanding
	(CVE-2026-84732)
        (both reliability layer bugs found by Mark Bregman <mark.bregman@fox-it.com>,
        tracked in Github: OpenVPN/openvpn-private-issues#161)
    Windows: fix CreateProcess() command line quoting for characters that are special
	to cmd.exe and where a combination of validation script plus rogue CA could
	lead to misbehavior (CVE-2026-84256)
        (Bug found by Clouditera Security <security@clouditera.com>, tracked
        in Github: OpenVPN/openvpn-private-issues#159)
    Windows: fix tapctl to always call netsh.exe with full path (as we do elsewhere)
	(CVE-2026-84226)
        (Bug found by BreachX Zero Day Labs, using Typhon AI Mil v2, tracked
        in Github: OpenVPN/openvpn-private-issues#164)
    Windows: don't use NULL DACL with system objects, namely the --service exit event
	and the netsh.exe guard semaphore. The old approach was prone to a local DoS
	where one user could interfere with other users' openvpn processes by
	blocking the netsh semaphore or sending events. This only affects setups not
	using the iservice, or using the automatic service to start/stop openvpn
	(CVE-2026-82312).
        (Bug found by DEBRAJ BASAK <https://in.linkedin.com/in/debrajbasak>,
        tracked in Github: OpenVPN/openvpn-private-issues#167)
    Linux Netlink: validate netlink replies against the request
        (Suggested by Joshua Rogers <contact@joshua.hu> as a security improvement,
        tracked in Github: OpenVPN/openvpn-private-issues#9)
    Windows: fix off-by-one on input validation in openvpnserv (discovered while
     fixing CVE-2026-78221)
    Windows: openvpnserv: pass correct NRPT domains size - when IDN domains with
     UTF8 encoding were involved, a buffer overread could be achieved (CVE-2026-78221).
        (Bug found by BreachX Zero Day Labs, using Typhon AI Mil v2,
        in Github: OpenVPN/openvpn-private-issues#162)
    Windows: harden CheckConfigPath() a bit more (another improvement while working
     on CVE-2026-78043)
    Windows: openvpnserv: don't allow '/' in config paths (the APIs windows uses for
     path validation do not handle '/' as path
        separator, while the file open APIs do, so this could be used to circumvent
	our config path validation, leading to openvpn.exe starting a user-controlled
	config file even if administatively not allowed. CVE-2026-78043)
        (Bug found by BreachX Zero Day Labs, using Typhon AI Mil v2,
        in Github: OpenVPN/openvpn-private-issues#162)
    Windows: dhcp: Fix off-by-one in write_dhcp_search_str() temp buffer guard
	(suitable DHCP options could lead to a single-byte overflow of a temp
        buffer, CVE-2026-81738)
        (Bug found by Andre Kropp (Nexory) and ChinhNguyen, tracked
        in Github: OpenVPN/openvpn-private-issues#165)
Bugfixes
    work around a pubkey-handling bug in mbedTLS 4.1.0 and 4.2.0 (supposedly fixed
	in 4.3.0)
    multi: don't let stale-routes-check delete permanent routes (the
    --stale-routes-check did not delete dynamic cached routes,
        but also routes installed by --iroute and --ifconfig-push - fix by
	introducing route flags and restraining the check on them)
        (Github: #1063)
    Windows: openvpnserv: fix log lines format string interface names with
	international characters printed in some error messages need to be converted
	from UTF8 to UCS16 first.
    clinat: do not adjust UDP checksum if zero (as per RFC768) (Github: #1037)
    OpenSSL: avoid resetting the HMAC key on every packet (Github: #1088)
    fix format string specifier for size_t (%zu)
    ssl: Do not queue control ciphertext while a packet is still queued (fixes
	problems in TCP p2p handshake when both sides try to handshake
        at the same time)
        (Github: #1089)
    Reenable xmit_hold when using p2p tcp-server and tls-server (in TCP server mode,
     the server is not expected to initiate the TLS
        handshake - bug introduced by the multisocket code, checking the wrong
	variable for socket protocol)
        (Github: #1089)
    fix test_misc compile issues with -Werror
User-visible Changes
    when using EPOCH data channel format, reduce number of future keys from 16 to 4
	(calculation was wrong, 4 spare keys are sufficient for 100+ Gbit/s links,
	less log spam in userland and less resources used in in-kernel implementations)
Building/Testing improvements
    clang-format: Convert deprecated setting KeepEmptyLinesAtTheStartOfBlocks
    t_client.sh: various improvements
Documentation improvements
    doc: Update doxygen references to removed tunnel_server_{udp, tcp}() (those
	functions do not exist in 2.7+ anymore)

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
---
 lfs/openvpn | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)