ID CVE-2009-1215
Summary Race condition in GNU screen 4.0.3 allows local users to create or overwrite arbitrary files via a symlink attack on the /tmp/screen-exchange temporary file.
References
Vulnerable Configurations
  • cpe:2.3:a:gnu:gnu_screen:4.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:gnu:gnu_screen:4.0.3:*:*:*:*:*:*:*
CVSS
Base: 1.9 (as of 17-08-2017 - 01:30)
Impact:
Exploitability:
CWE CWE-362
CAPEC
  • Leveraging Race Conditions
    This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
  • Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
    This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
Access
VectorComplexityAuthentication
LOCAL MEDIUM NONE
Impact
ConfidentialityIntegrityAvailability
NONE PARTIAL NONE
cvss-vector via4 AV:L/AC:M/Au:N/C:N/I:P/A:N
refmap via4
bid 34521
confirm
misc http://savannah.gnu.org/bugs/?25296
mlist [oss-security] 20090325 CVE request -- zsh, XFree86-xfs/xorg-x11-xfs, screen
xf screen-screenexchange-symlink(49887)
statements via4
contributor Tomas Hoger
lastmodified 2009-04-02
organization Red Hat
statement Red Hat does not consider this to be a security issue. The checks implemented by screen to protect against race condition attacks on /tmp/screen-exchange file provide sufficient protection for this rarely-used buffer exchange feature. For more details, see https://bugzilla.redhat.com/show_bug.cgi?id=492104
Last major update 17-08-2017 - 01:30
Published 01-04-2009 - 10:30
Back to Top