Description
Off-by-one error in the ppscan function (preproc.c) in Netwide Assembler (NASM) 2.02 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted file that triggers a stack-based buffer overflow.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nasm | 2.03.01-1 | — |
| Debian 13 | nasm | 2.03.01-1 | — |
| Debian 12 | nasm | 2.03.01-1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- NASM 2.0 - 'ppscan()' Off-by-One Buffer Overflow EDB-31903 · remote · Jun 21, 2008 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 29656 vdb-entry
- https://sourceforge.net/tracker/?func=detail&atid=106208&aid=1942146&group_id=6208
- https://sourceforge.net/project/shownotes.php?group_id=6208&release_id=606115
- http://repo.or.cz/w/nasm.git?a=commit%3Bh=76ec8e73db16f4cf1453a142d03bcc74d528f72f
- MDVSA-2008:120 vendor-advisory
- 30594 third-party-advisory
- nasm-ppscan-bo(42995) vdb-entry
- 32059 third-party-advisory
- [oss-security] 20080611 Re: CVE id request: nasm off-by-one mailing-list
- ADV-2008-1811 vdb-entry
- USN-648-1 vendor-advisory
- 1020259 vdb-entry
- [oss-security] 20080611 CVE id request: nasm off-by-one mailing-list