CVE-2023-52887

In the Linux kernel, the following vulnerability has been resolved:

net: can: j1939: enhanced error handling for tightly received RTS messages in xtp_rx_rts_session_new

This patch enhances error handling in scenarios with RTS (Request to Send) messages arriving closely. It replaces the less informative WARN_ON_ONCE backtraces with a new error handling method. This provides clearer error messages and allows for the early termination of problematic sessions. Previously, sessions were only released at the end of j1939_xtp_rx_rts().

Potentially this could be reproduced with something like: testj1939 -r vcan0:0x80 & while true; do # send first RTS cansend vcan0 18EC8090#1014000303002301; # send second RTS cansend vcan0 18EC8090#1014000303002301; # send abort cansend vcan0 18EC8090#ff00000000002301; done

Weakness

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected Software

Extended Description

While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.

Potential Mitigations

References

• https://git.kernel.org/stable/c/0bc0a7416ea73f79f915c9a05ac0858dff65cfed
• https://git.kernel.org/stable/c/1762ca80c2b72dd1b5821c5e347713ae696276ea
• https://git.kernel.org/stable/c/177e33b655d35d72866b50aec84307119dc5f3d4
• https://git.kernel.org/stable/c/26b18dd30e63d4fd777be429148e8e4ed66f60b2
• https://git.kernel.org/stable/c/d3e2904f71ea0fe7eaff1d68a2b0363c888ea0fb
• https://git.kernel.org/stable/c/ed581989d7ea9df6f8646beba2341e32cd49a1f9
• https://git.kernel.org/stable/c/f6c839e717901dbd6b1c1ca807b6210222eb70f6
• https://git.kernel.org/stable/c/0bc0a7416ea73f79f915c9a05ac0858dff65cfed
• https://git.kernel.org/stable/c/1762ca80c2b72dd1b5821c5e347713ae696276ea
• https://git.kernel.org/stable/c/177e33b655d35d72866b50aec84307119dc5f3d4
• https://git.kernel.org/stable/c/26b18dd30e63d4fd777be429148e8e4ed66f60b2
• https://git.kernel.org/stable/c/d3e2904f71ea0fe7eaff1d68a2b0363c888ea0fb
• https://git.kernel.org/stable/c/ed581989d7ea9df6f8646beba2341e32cd49a1f9
• https://git.kernel.org/stable/c/f6c839e717901dbd6b1c1ca807b6210222eb70f6
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html