USN-56-1: exim4 vulnerabilities
Posted on: 01/07/2005 03:07 PM

An exim4 security update has been released for Ubuntu Linux 4.10

Ubuntu Security Notice USN-56-1 January 07, 2005
exim4 vulnerabilities
CAN-2005-0021, CAN-2005-0022

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 4.34-5ubuntu1.1. In general, a standard system upgrade is sufficient to effect the necessary changes.

Details follow:

A flaw has been found in the host_aton() function, which can overflow a buffer if it is presented with an illegal IPv6 address that has more than 8 components. When supplying certain command line parameters, the input was not checked, so that a local attacker could possibly exploit the buffer overflow to run arbitrary code with the privileges of the Exim mail server. (CAN-2005-0021)

Additionally, the BASE64 decoder in the SPA authentication handler did not check the size of its output buffer. By sending an invalid BASE64 authentication string, a remote attacker could overflow the buffer, which could possibly be exploited to run arbitrary code with the privileges of the Exim mail server. (CAN-2005-0022)

Source archives:
Size/MD5: 463699 cdb8d46e351c34fc1f89536fdae343da
Size/MD5: 1080 864fe588fae6035a5e258f5c04cf7dab
Size/MD5: 1717473 acdf7117f18b71702d4da284b1263275

Architecture independent packages:
Size/MD5: 171766 9c845bd86beaee3d52c42c813b1ad032
Size/MD5: 1200 5cd02a62d88ba49c5df8008938ef4f65

amd64 architecture (Athlon64, Opteron, EM64T Xeon)
Size/MD5: 787866 e748245e594745259b3708545aa6c4b1
Size/MD5: 431982 a3027eeb99010ec3fbbd9ed8d7602c6b
Size/MD5: 360702 407afc6744039f296993d4a0b0d07203
Size/MD5: 73474 22e6e191c1a624555ddcb0dbef570398

i386 architecture (x86 compatible Intel/AMD)
Size/MD5: 784452 20baa66e23f89210828da736e978dcf2
Size/MD5: 406080 0fca8d0a724c1028847e4770640abd00
Size/MD5: 336978 b479636f03f2f370443109e7d69a8a4b
Size/MD5: 69218 e230f352300632a19d0f36ef8c4b6ca7

powerpc architecture (Apple Macintosh G3/G4/G5)
Size/MD5: 792338 4f59dfd48441b4ba58cf7379278b5414
Size/MD5: 437952 7c0e3eb42f5aaf21c56571e4ce76e863
Size/MD5: 364814 d89db8c70e78070c8cad5e64e99702ab
Size/MD5: 74848 6e9f16cbaf431df8412748c98ba2561b

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