I have produced a test pkg including the potential fix candidate above for the impacted UA customer to test in their lab.
Unfortunately, I have no access to a reproducer since this fuzzer is proprietary and need to be purchased. Meaning, the testing will rely on UA customer end. - Eric ** Description changed: - I'm reporting this bug to keep track of it, as of today I'm still - collecting informations. + Here's what has been brought to my attention by a UA customer: - Here's what I have gathered so far: + * Release: + Xenial/16.04LTS - Release: Xenial/16.04LTS - Openssh version :7.2p2-4ubuntu2.10 - Fuzzer tool used: https://www.synopsys.com/software-integrity/security-testing/fuzz-testing.html (proprietary software) + * Openssh version: + 7.2p2-4ubuntu2.10 + + * Fuzzer tool used: + https://www.synopsys.com/software-integrity/security-testing/fuzz testing.html (proprietary software) As of today, I have no access to a reproducer. Still working on getting - access to one and better understand what the failing test scenario is - doing. + access to one (if possible) in order to better understand what the + failing test scenario is doing. - gdb backtrace: + * coredump: + $ gdb $(which sshd) core.cic-1.domain.tld.1612566260.sshd.20731 ... Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `sshd: [net] '. Program terminated with signal SIGSEGV, Segmentation fault. #0 __memcpy_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:136 136 ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S: No such file or directory. (gdb) bt #0 __memcpy_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:136 #1 0x00007fec25b241db in memcpy (__len=<optimized out>, __src=0x0, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:53 #2 aes_gcm_ctrl (c=0x558a7ae19758, type=<optimized out>, arg=<optimized out>, ptr=0x0) at e_aes.c:1189 #3 0x00007fec25b20897 in EVP_CIPHER_CTX_ctrl (ctx=ctx@entry=0x558a7ae19758, type=type@entry=18, arg=arg@entry=-1, ptr=ptr@entry=0x0) at evp_enc.c:619 #4 0x0000558a7953f54c in cipher_init (cc=cc@entry=0x558a7ae19750, cipher=0x558a797b3ef0 <ciphers+720>, key=0x0, keylen=32, iv=0x0, ivlen=<optimized out>, do_encrypt=0) at ../cipher.c:336 #5 0x0000558a7954521a in ssh_set_newkeys (ssh=ssh@entry=0x558a7ae18ef0, mode=mode@entry=0)at ../packet.c:919 #6 0x0000558a7955ae92 in kex_input_newkeys (type=<optimized out>, seq=<optimized out>, ctxt=0x558a7ae18ef0)at ../kex.c:434 #7 0x0000558a7954d269 in ssh_dispatch_run (ssh=ssh@entry=0x558a7ae18ef0, mode=0, done=0x558a7ae18278, ctxt=0x558a7ae18ef0) at ../dispatch.c:119 #8 0x0000558a7954d2b9 in ssh_dispatch_run_fatal (ssh=0x558a7ae18ef0, mode=<optimized out>, done=<optimized out>, ctxt=<optimized out>) at ../dispatch.c:140 #9 0x0000558a79502770 in do_ssh2_kex () at ../sshd.c:2744 #10 main (ac=<optimized out>, av=<optimized out>) at ../sshd.c:2301 (gdb) ** Summary changed: - Defensics fuzzer testing tool cause openssh to segfault + Defensics' synopsys fuzzer testing tool cause openssh to segfault ** Description changed: Here's what has been brought to my attention by a UA customer: * Release: Xenial/16.04LTS * Openssh version: 7.2p2-4ubuntu2.10 - * Fuzzer tool used: - https://www.synopsys.com/software-integrity/security-testing/fuzz testing.html (proprietary software) + * Fuzzer tool used: + https://www.synopsys.com/software-integrity/security-testing/fuzz-testing.html(proprietary software) As of today, I have no access to a reproducer. Still working on getting access to one (if possible) in order to better understand what the failing test scenario is doing. * coredump: $ gdb $(which sshd) core.cic-1.domain.tld.1612566260.sshd.20731 ... Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `sshd: [net] '. Program terminated with signal SIGSEGV, Segmentation fault. #0 __memcpy_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:136 136 ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S: No such file or directory. (gdb) bt #0 __memcpy_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:136 #1 0x00007fec25b241db in memcpy (__len=<optimized out>, __src=0x0, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:53 #2 aes_gcm_ctrl (c=0x558a7ae19758, type=<optimized out>, arg=<optimized out>, ptr=0x0) at e_aes.c:1189 #3 0x00007fec25b20897 in EVP_CIPHER_CTX_ctrl (ctx=ctx@entry=0x558a7ae19758, type=type@entry=18, arg=arg@entry=-1, ptr=ptr@entry=0x0) at evp_enc.c:619 #4 0x0000558a7953f54c in cipher_init (cc=cc@entry=0x558a7ae19750, cipher=0x558a797b3ef0 <ciphers+720>, key=0x0, keylen=32, iv=0x0, ivlen=<optimized out>, do_encrypt=0) at ../cipher.c:336 #5 0x0000558a7954521a in ssh_set_newkeys (ssh=ssh@entry=0x558a7ae18ef0, mode=mode@entry=0)at ../packet.c:919 #6 0x0000558a7955ae92 in kex_input_newkeys (type=<optimized out>, seq=<optimized out>, ctxt=0x558a7ae18ef0)at ../kex.c:434 #7 0x0000558a7954d269 in ssh_dispatch_run (ssh=ssh@entry=0x558a7ae18ef0, mode=0, done=0x558a7ae18278, ctxt=0x558a7ae18ef0) at ../dispatch.c:119 #8 0x0000558a7954d2b9 in ssh_dispatch_run_fatal (ssh=0x558a7ae18ef0, mode=<optimized out>, done=<optimized out>, ctxt=<optimized out>) at ../dispatch.c:140 #9 0x0000558a79502770 in do_ssh2_kex () at ../sshd.c:2744 #10 main (ac=<optimized out>, av=<optimized out>) at ../sshd.c:2301 (gdb) ** Description changed: Here's what has been brought to my attention by a UA customer: * Release: Xenial/16.04LTS * Openssh version: 7.2p2-4ubuntu2.10 * Fuzzer tool used: - https://www.synopsys.com/software-integrity/security-testing/fuzz-testing.html(proprietary software) + https://www.synopsys.com/software-integrity/security-testing/fuzz-testing.html (proprietary software) As of today, I have no access to a reproducer. Still working on getting access to one (if possible) in order to better understand what the failing test scenario is doing. * coredump: $ gdb $(which sshd) core.cic-1.domain.tld.1612566260.sshd.20731 ... Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `sshd: [net] '. Program terminated with signal SIGSEGV, Segmentation fault. #0 __memcpy_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:136 136 ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S: No such file or directory. (gdb) bt #0 __memcpy_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:136 #1 0x00007fec25b241db in memcpy (__len=<optimized out>, __src=0x0, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:53 #2 aes_gcm_ctrl (c=0x558a7ae19758, type=<optimized out>, arg=<optimized out>, ptr=0x0) at e_aes.c:1189 #3 0x00007fec25b20897 in EVP_CIPHER_CTX_ctrl (ctx=ctx@entry=0x558a7ae19758, type=type@entry=18, arg=arg@entry=-1, ptr=ptr@entry=0x0) at evp_enc.c:619 #4 0x0000558a7953f54c in cipher_init (cc=cc@entry=0x558a7ae19750, cipher=0x558a797b3ef0 <ciphers+720>, key=0x0, keylen=32, iv=0x0, ivlen=<optimized out>, do_encrypt=0) at ../cipher.c:336 #5 0x0000558a7954521a in ssh_set_newkeys (ssh=ssh@entry=0x558a7ae18ef0, mode=mode@entry=0)at ../packet.c:919 #6 0x0000558a7955ae92 in kex_input_newkeys (type=<optimized out>, seq=<optimized out>, ctxt=0x558a7ae18ef0)at ../kex.c:434 #7 0x0000558a7954d269 in ssh_dispatch_run (ssh=ssh@entry=0x558a7ae18ef0, mode=0, done=0x558a7ae18278, ctxt=0x558a7ae18ef0) at ../dispatch.c:119 #8 0x0000558a7954d2b9 in ssh_dispatch_run_fatal (ssh=0x558a7ae18ef0, mode=<optimized out>, done=<optimized out>, ctxt=<optimized out>) at ../dispatch.c:140 #9 0x0000558a79502770 in do_ssh2_kex () at ../sshd.c:2744 #10 main (ac=<optimized out>, av=<optimized out>) at ../sshd.c:2301 (gdb) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1930286 Title: Defensics' synopsys fuzzer testing tool cause openssh to segfault To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1930286/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
