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- CVEs with nessus.description==The remote host is affected by the vulnerability described in GLSA-200402-02 (XFree86 Font Information File Buffer Overflow)
Exploitation of a buffer overflow in The XFree86 Window System discovered by iDefence allows local attackers to gain root privileges.
The problem exists in the parsing of the 'font.alias' file. The X server (running as root) fails to check the length of the user provided input, so a malicious user may craft a malformed 'font.alias' file causing a buffer overflow upon parsing, eventually leading to the execution of arbitrary code.
To reproduce the overflow on the command line one can run:
# cat > fonts.dir <<EOF 1 word.bdf -misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso8859-1 EOF # perl -e 'print '0' x 1024 . 'A' x 96 . '\\n'' > fonts.alias # X :0 -fp $PWD {Some output removed}... Server aborting... Segmentation fault (core dumped) Impact :
Successful exploitation can lead to a root compromise provided that the attacker is able to execute commands in the X11 subsystem. This can be done either by having console access to the target or through a remote exploit against any X client program such as a web-browser, mail-reader or game.
Workaround :
No immediate workaround is available; a software upgrade is required.
Gentoo has released XFree 4.2.1-r3, 4.3.0-r4 and 4.3.99.902-r1 and encourages all users to upgrade their XFree86 installations. Vulnerable versions are no longer available in Portage.
Max CVSS | 0 |
Min CVSS | 0 |
Total Count | 2 |
| ID | CVSS | Summary | Last (major) update | Published |
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