Description
The extension parser in slp_v2message.c in OpenSLP 1.2.1, and other versions before SVN revision 1647, as used in Service Location Protocol daemon (SLPD) in VMware ESX 4.0 and 4.1 and ESXi 4.0 and 4.1, allows remote attackers to cause a denial of service (infinite loop) via a packet with a "next extension offset" that references this extension or a previous extension. NOTE: some of these details are obtained from third party information.
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 6.0 | openslp-dfsg | 1.2.1-7.8+deb6u1 | DLA-304-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openslp | 2.0.0-8.1 | openSUSE-SU-2024:10065-1 |
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.
Exploit-DB 1
- OpenSLP 1.2.1 / < 1647 trunk - Denial of Service EDB-17610 · dos · Aug 5, 2011
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- DLA-304-1 openslp-dfsg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10065-1 openslp-2.0.0-8.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- VU#393783 third-party-advisory
- [security-announce] 20110307 VMSA-2011-0004 VMware ESX/ESXi SLPD denial of service vulnerability and ESX third party updates for Service Console packages bind, pam, and rpm mailing-list
- https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0227
- 43742 third-party-advisory
- 71019 vdb-entry
- ADV-2011-0606 vdb-entry
- MDVSA-2013:111 vendor-advisory
- 20110308 VMSA-2011-0004 VMware ESX/ESXi SLPD denial of service vulnerability and ESX third party updates for Service Console packages bind, pam, and rpm. mailing-list
- 8127 third-party-advisory
- 1025168 vdb-entry
- GLSA-201707-05 vendor-advisory
- vmware-esxserver-slpd-dos(65931) vdb-entry
- ADV-2011-0729 vdb-entry
- MDVSA-2012:141 vendor-advisory
- 46772 vdb-entry
- 43601 third-party-advisory
- http://www.vmware.com/security/advisories/VMSA-2011-0004.html