Source: nasm
Version: 2.13.02-0.1
Severity: important
Tags: security upstream
Forwarded: https://bugzilla.nasm.us/show_bug.cgi?id=3392445
Hi,
The following vulnerability was published for nasm:
CVE-2018-8882[0]:
| Netwide Assembler (NASM) 2.13.02rc2 has a stack-based buffer under-read
| in the function ieee_shr in asm/float.c via a large shift value.
The issue is verifiable with an ASAN build of nasm.
----cut---------cut---------cut---------cut---------cut---------cut-----
$ nasm -felf64 411616
411616:16: error: comma, colon, decorator or end of line expected after operand
411616:21: error: parser: instruction expected
411616:30: error: label or instruction expected at start of line
411616:33: error: comma, colon, decorator or end of line expected after operand
411616:34: error: comma, colon, decorator or end of line expected after operand
411616:39: error: comma, colon, decorator or end of line expected after operand
=================================================================
==5602==ERROR: AddressSanitizer: stack-buffer-overflow on address
0x7ffdc0250564 at pc 0x559c536f0418 bp 0x7ffdc0250420 sp 0x7ffdc0250418
READ of size 4 at 0x7ffdc0250564 thread T0
#0 0x559c536f0417 (/usr/bin/nasm+0x330417)
#1 0x559c536f3fbc (/usr/bin/nasm+0x333fbc)
#2 0x559c53624394 (/usr/bin/nasm+0x264394)
#3 0x559c535f0c43 (/usr/bin/nasm+0x230c43)
#4 0x559c535e9bbe (/usr/bin/nasm+0x229bbe)
#5 0x7f37551a3a86 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21a86)
#6 0x559c535eba39 (/usr/bin/nasm+0x22ba39)
Address 0x7ffdc0250564 is located in stack of thread T0 at offset 84 in frame
#0 0x559c536f2ecf (/usr/bin/nasm+0x332ecf)
This frame has 2 object(s):
[32, 36) 'exponent'
[96, 120) 'mant' <== Memory access at offset 84 underflows this variable
HINT: this may be a false positive if your program uses some custom stack
unwind mechanism or swapcontext
(longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow (/usr/bin/nasm+0x330417)
Shadow bytes around the buggy address:
0x100038042050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x100038042060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x100038042070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x100038042080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x100038042090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x1000380420a0: 00 00 f1 f1 f1 f1 04 f2 f2 f2 f2 f2[f2]f2 00 00
0x1000380420b0: 00 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1000380420c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1000380420d0: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
0x1000380420e0: 02 f2 f2 f2 f2 f2 f2 f2 00 00 f2 f2 f2 f2 f2 f2
0x1000380420f0: f8 f8 f8 f8 f2 f2 f2 f2 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==5602==ABORTING
----cut---------cut---------cut---------cut---------cut---------cut-----
If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.
For further information see:
[0] https://security-tracker.debian.org/tracker/CVE-2018-8882
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8882
[1] https://bugzilla.nasm.us/show_bug.cgi?id=3392445
Please adjust the affected versions in the BTS as needed.
Regards,
Salvatore
