sunrpc: handle SVC_GARBAGE during svc auth processing as auth error
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.4, 6.6.95, 6.12.35, 6.15.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: total
Summary
In the Linux kernel, the following vulnerability has been resolved: sunrpc: handle SVC_GARBAGE during svc auth processing as auth error tianshuo han reported a remotely-triggerable crash if the client sends a kernel RPC server a specially crafted packet. If decoding the RPC reply fails in such a way that SVC_GARBAGE is returned without setting the rq_accept_statp pointer, then that pointer can be dereferenced and a value stored there. If it's the first time the thread has processed an RPC, then that pointer will be set to NULL and the kernel will crash. In other cases, it could create a memory scribble. The server sunrpc code treats a SVC_GARBAGE return from svc_authenticate or pg_authenticate as if it should send a GARBAGE_ARGS reply. RFC 5531 says that if authentication fails that the RPC should be rejected instead with a status of AUTH_ERR. Handle a SVC_GARBAGE return as an AUTH_ERROR, with a reason of AUTH_BADCRED instead of returning GARBAGE_ARGS in that case. This sidesteps the whole problem of touching the rpc_accept_statp pointer in this situation and avoids the crash.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 · fixed in 599c489eea793821232a2f69a00fa57d82b0ac98; From 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 · fixed in 353e75b55e583635bf71cde6abcec274dba05edd; From 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 · fixed in c90459cd58bb421d275337093d8e901e0ba748dd; From 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 · fixed in 94d10a4dba0bc482f2b01e39f06d5513d0f75742; From 6.3.4 · fixed in 6.4
- Linux Linux
6.4
- KernelLinux
From 6.4.0 · fixed in 6.6.95; From 6.7.0 · fixed in 6.12.35; From 6.13.0 · fixed in 6.15.4