USN-34-1: OpenSSH information leakage
Posted on: 11/30/2004 08:32 AM

Updated OpenSSH packages are available for Ubuntu Linux 4.10

Ubuntu Security Notice USN-34-1 November 30, 2004
openssh information leakage

A security issue affects the following Ubuntu releases:

Ubuntu 4.10 (Warty Warthog)

The following packages are affected:


The problem can be corrected by upgrading the affected package to version 1:3.8.1p1-11ubuntu3.1. In general, a standard system upgrade is sufficient to effect the necessary changes.

Details follow: discovered two information leaks in the OpenSSH server. When using password authentication, an attacker could test whether a login name exists by measuring the time between failed login attempts, i. e. the time after which the "password:" prompt appears again.

A similar issue affects systems which do not allow root logins over ssh ("PermitRootLogin no"). By measuring the time between login attempts an attacker could check whether a given root password is correct. This allowed determining weak root passwords using a brute force attack.

Source archives:
Size/MD5: 145620 71fa539badedbda58b58ef29139fd413
Size/MD5: 878 5bdd27605cc38bce0cce01bcf9928808
Size/MD5: 795948 9ce6f2fa5b2931ce2c4c25f3af9ad50d

Architecture independent packages:
Size/MD5: 29960 3d5e1b4e769a8be10b5ad1cd908006c5

amd64 architecture (Athlon64, Opteron, EM64T Xeon)
Size/MD5: 159444 ce407a70f38f37485388c34c94393fd9
Size/MD5: 523912 ac9f40baaf37c837a8e64c143a34c108
Size/MD5: 176144 100759d267228eabdac0a9a23184037a
Size/MD5: 263678 d9d4725937238c22b5fa327403bcf245
Size/MD5: 53194 4fd64b84d4f0a63701d23d5fd87b52dd

i386 architecture (x86 compatible Intel/AMD)
Size/MD5: 133700 b2bf27c8cdc5d6cd8ae995313c13f81f
Size/MD5: 473924 314a6883e04062404aab218bf23b997f
Size/MD5: 146854 25ef6479f1e832ba4d0d351b57f682d8
Size/MD5: 241474 f1f1d95c368d3cd50c0bba78b0b7424e
Size/MD5: 52844 e7b3f36414c2c7b19d9c7c2a10880c33

powerpc architecture (Apple Macintosh G3/G4/G5)
Size/MD5: 151096 287eb4b1f2811762eb7b2d3fdce85493
Size/MD5: 520712 a6bd03bb888f41463ae096d5a2d963a1
Size/MD5: 160180 f44ab8929b5404e7781b8e643523fece
Size/MD5: 257838 f074b6568e4d6eb53fff2c910ce57448
Size/MD5: 54312 7c23a096535c939783f4855d089fa39e

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