Description
sngrep through 1.9.0 contains an infinite loop vulnerability in capture_packet_reasm_ip() in src/capture.c that allows attackers to cause denial of service via crafted NFLOG TLVs. Attackers can supply a pcap file with link type NFLOG containing a non-payload TLV with length under 4, making the capture thread spin at full CPU and stop processing packets.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| irontec | sngrep | ≤ 1.9.0 | — |
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 | sngrep | No fix yet | — |
| Debian 13 | sngrep | No fix yet | — |
| Debian 12 | sngrep | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | sngrep | No fix yet | — |
| Ubuntu 26.04 LTS | sngrep | No fix yet | — |
| Ubuntu 24.04 LTS | sngrep | No fix yet | — |
| Ubuntu 22.04 LTS | sngrep | No fix yet | — |
| Ubuntu 20.04 LTS | sngrep | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | sngrep | No fix yet | — |
| Ubuntu 16.04 LTS | sngrep | No fix yet | — |
References
- https://github.com/irontec/sngrep/issues/589 issue-tracking
- https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read third-party-advisory
- https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598 technical-description
- VulnCheck Advisory: sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV third-party-advisory