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fatal: DH_GEX_REQUEST, bad parameter

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Operating Systems Solaris fatal: DH_GEX_REQUEST, bad parameter
# 1  
Old 03-20-2012
Network fatal: DH_GEX_REQUEST, bad parameter
HI,all

I'm SYS admin. when i doing healthcheck for the SUN M5000 server i found messages as below.

Code:
Mar 19 16:38:32 sccuossw1 sshd[10781]: [ID 800047 auth.crit] fatal: DH_GEX_REQUEST, bad parameters: 1024 !< 2048 !< 2046
Mar 19 16:38:37 sccuossw1 in.dhcpd[5427]: [ID 603263 daemon.notice] No more IP addresses on 192.168.1.32 network (01001E6713DA9A)
Mar 19 16:38:42 sccuossw1 last message repeated 2 times
Mar 19 16:38:46 sccuossw1 sshd[10908]: [ID 800047 auth.crit] fatal: DH_GEX_REQUEST, bad parameters: 1024 !< 2048 !< 2046
Mar 19 16:39:00 sccuossw1 sendmail[10358]: [ID 702911 mail.alert] unable to qualify my own domain name (sccuossw1) -- using short name
Mar 19 16:39:08 sccuossw1 sshd[11261]: [ID 800047 auth.crit] fatal: DH_GEX_REQUEST, bad parameters: 1024 !< 2048 !< 2046
Mar 19 16:39:16 sccuossw1 sshd[11395]: [ID 800047 auth.crit] fatal: DH_GEX_REQUEST, bad parameters: 1024 !< 2048 !< 2046
Mar 19 16:39:25 sccuossw1 sshd[11508]: [ID 800047 auth.crit] fatal: DH_GEX_REQUEST, bad parameters: 1024 !< 2048 !< 2046
Mar 19 16:39:46 sccuossw1 in.dhcpd[5427]: [ID 603263 daemon.notice] No more IP addresses on 192.168.1.32 network (01001E6713DA9A)
Mar 19 16:39:52 sccuossw1 last message repeated 2 times
Mar 19 16:40:14 sccuossw1 sshd[13735]: [ID 800047 auth.crit] fatal: DH_GEX_REQUEST, bad parameters: 1024 !< 2048 !< 2046
Mar 19 16:40:46 sccuossw1 sshd[14643]: [ID 800047 auth.crit] fatal: DH_GEX_REQUEST, bad parameters: 1024 !< 2048 !< 2046

what is this messages mean? I haven't found some useful information by google.

Moderator's Comments:
Mod Comment Use code tags, see PM, thanks.
Last edited by anline5104; 03-20-2012 at 06:36 AM.. Reason: code tags
# 2  
Old 03-23-2012
A quick google myself shows this to be an error to do with the key exchange in ssh, a GEX request has three values:
minimal size in bits of an acceptable group
preferred size in bits of the group the server will send
maximal size in bits of an acceptable group

It feels like your sshd is trying to indicate a preferred size larger than it's maximal size.

First instinct: Someone put a rubbish sshd in place of the standard sun one, or it's a bung patch on sun's one.
Second thoughts: Someone installed a dodgy sshd as a backdoor / password snooper
Third thought: Check the config in /etc/ssh/sshd_config for crazy entries, also consider blowing away your host key and regenerating it (sshd host key, not ssh auth keys)

Other thoughts:
pkgchk, cksum against a known good sshd someplace, ldd to see what libraries it's using (OpenSSL vs SUNWSSL vs EVILHAX0Rssl)
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